NO121308B - - Google Patents
Download PDFInfo
- Publication number
- NO121308B NO121308B NO167065A NO16706567A NO121308B NO 121308 B NO121308 B NO 121308B NO 167065 A NO167065 A NO 167065A NO 16706567 A NO16706567 A NO 16706567A NO 121308 B NO121308 B NO 121308B
- Authority
- NO
- Norway
- Prior art keywords
- chloramphenicol
- chloride
- mol
- solution
- oxyacid
- Prior art date
Links
- WIIZWVCIJKGZOK-RKDXNWHRSA-N chloramphenicol Chemical class ClC(Cl)C(=O)N[C@H](CO)[C@H](O)C1=CC=C([N+]([O-])=O)C=C1 WIIZWVCIJKGZOK-RKDXNWHRSA-N 0.000 claims description 40
- 229960005091 chloramphenicol Drugs 0.000 claims description 38
- 239000000203 mixture Substances 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 150000002148 esters Chemical class 0.000 claims description 9
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 238000001953 recrystallisation Methods 0.000 claims description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 2
- 235000019439 ethyl acetate Nutrition 0.000 claims description 2
- 239000001257 hydrogen Substances 0.000 claims description 2
- 229910052739 hydrogen Inorganic materials 0.000 claims description 2
- 230000009967 tasteless effect Effects 0.000 claims description 2
- 239000000243 solution Substances 0.000 description 32
- WSLDOOZREJYCGB-UHFFFAOYSA-N 1,2-Dichloroethane Chemical compound ClCCCl WSLDOOZREJYCGB-UHFFFAOYSA-N 0.000 description 24
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 16
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 15
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 12
- 239000000047 product Substances 0.000 description 12
- 238000003756 stirring Methods 0.000 description 12
- FYSNRJHAOHDILO-UHFFFAOYSA-N thionyl chloride Chemical compound ClS(Cl)=O FYSNRJHAOHDILO-UHFFFAOYSA-N 0.000 description 12
- 239000000126 substance Substances 0.000 description 11
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 8
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 7
- 150000005690 diesters Chemical class 0.000 description 7
- 238000007710 freezing Methods 0.000 description 7
- 230000008014 freezing Effects 0.000 description 7
- 239000011541 reaction mixture Substances 0.000 description 7
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 6
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 6
- 239000000725 suspension Substances 0.000 description 6
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 4
- 125000002252 acyl group Chemical group 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 229910052938 sodium sulfate Inorganic materials 0.000 description 4
- 235000011152 sodium sulphate Nutrition 0.000 description 4
- QUSKDDUBDHHWTF-UHFFFAOYSA-N 2-hydroxy-3-oxohexanoyl chloride Chemical compound C(CCC)(=O)C(C(=O)Cl)O QUSKDDUBDHHWTF-UHFFFAOYSA-N 0.000 description 3
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 239000012452 mother liquor Substances 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 3
- 235000017557 sodium bicarbonate Nutrition 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- JNCAWSNHLHBEIS-UHFFFAOYSA-N (2-chloro-2-oxoethyl) octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(Cl)=O JNCAWSNHLHBEIS-UHFFFAOYSA-N 0.000 description 2
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- IPCSVZSSVZVIGE-UHFFFAOYSA-N hexadecanoic acid Chemical compound CCCCCCCCCCCCCCCC(O)=O IPCSVZSSVZVIGE-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 125000001312 palmitoyl group Chemical group O=C([*])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 230000001225 therapeutic effect Effects 0.000 description 2
- 238000002560 therapeutic procedure Methods 0.000 description 2
- HZDNNJABYXNPPV-UHFFFAOYSA-N (2-chloro-2-oxoethyl) acetate Chemical compound CC(=O)OCC(Cl)=O HZDNNJABYXNPPV-UHFFFAOYSA-N 0.000 description 1
- NGNBDVOYPDDBFK-UHFFFAOYSA-N 2-[2,4-di(pentan-2-yl)phenoxy]acetyl chloride Chemical compound CCCC(C)C1=CC=C(OCC(Cl)=O)C(C(C)CCC)=C1 NGNBDVOYPDDBFK-UHFFFAOYSA-N 0.000 description 1
- ZCWFUSQQIIEPSA-UHFFFAOYSA-N 2-hydroxy-3-oxo-2-phenylicosanoyl chloride Chemical compound C(CCCCCCCCCCCCCCCCC)(=O)C(C(=O)Cl)(O)C1=CC=CC=C1 ZCWFUSQQIIEPSA-UHFFFAOYSA-N 0.000 description 1
- ZIWQTDIDVQRWAH-UHFFFAOYSA-N 2-hydroxy-3-oxobutanoyl chloride Chemical compound CC(=O)C(O)C(Cl)=O ZIWQTDIDVQRWAH-UHFFFAOYSA-N 0.000 description 1
- GQKIPHLPMKOMBV-UHFFFAOYSA-N 2-hydroxy-3-oxohexanoic acid Chemical compound CCCC(=O)C(O)C(O)=O GQKIPHLPMKOMBV-UHFFFAOYSA-N 0.000 description 1
- LCIMJULVQOQTEZ-UHFFFAOYSA-N 2-hydroxyacetyl chloride Chemical compound OCC(Cl)=O LCIMJULVQOQTEZ-UHFFFAOYSA-N 0.000 description 1
- HWLBIEAKJSRKOD-UHFFFAOYSA-N 2-octadecanoyloxyacetic acid Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(O)=O HWLBIEAKJSRKOD-UHFFFAOYSA-N 0.000 description 1
- XVMSFILGAMDHEY-UHFFFAOYSA-N 6-(4-aminophenyl)sulfonylpyridin-3-amine Chemical compound C1=CC(N)=CC=C1S(=O)(=O)C1=CC=C(N)C=N1 XVMSFILGAMDHEY-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- 238000006418 Brown reaction Methods 0.000 description 1
- ZAFNJMIOTHYJRJ-UHFFFAOYSA-N Diisopropyl ether Chemical compound CC(C)OC(C)C ZAFNJMIOTHYJRJ-UHFFFAOYSA-N 0.000 description 1
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- AEMRFAOFKBGASW-UHFFFAOYSA-M Glycolate Chemical compound OCC([O-])=O AEMRFAOFKBGASW-UHFFFAOYSA-M 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 235000021314 Palmitic acid Nutrition 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- QMGGUIASDZZMHS-UHFFFAOYSA-N Stearoyllactic acid Chemical compound CCCCCCCCCCCCCCCCCC(=O)OC(C)C(O)=O QMGGUIASDZZMHS-UHFFFAOYSA-N 0.000 description 1
- 150000001241 acetals Chemical class 0.000 description 1
- 230000010933 acylation Effects 0.000 description 1
- 238000005917 acylation reaction Methods 0.000 description 1
- 239000003242 anti bacterial agent Substances 0.000 description 1
- 229940088710 antibiotic agent Drugs 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000003385 bacteriostatic effect Effects 0.000 description 1
- 230000003115 biocidal effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 150000001649 bromium compounds Chemical class 0.000 description 1
- BTANRVKWQNVYAZ-UHFFFAOYSA-N butan-2-ol Chemical compound CCC(C)O BTANRVKWQNVYAZ-UHFFFAOYSA-N 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 239000012230 colorless oil Substances 0.000 description 1
- 239000012043 crude product Substances 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 239000008298 dragée Substances 0.000 description 1
- 230000032050 esterification Effects 0.000 description 1
- 238000005886 esterification reaction Methods 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000010255 intramuscular injection Methods 0.000 description 1
- 239000007927 intramuscular injection Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- WQEPLUUGTLDZJY-UHFFFAOYSA-N n-Pentadecanoic acid Natural products CCCCCCCCCCCCCCC(O)=O WQEPLUUGTLDZJY-UHFFFAOYSA-N 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- YBBRCQOCSYXUOC-UHFFFAOYSA-N sulfuryl dichloride Chemical compound ClS(Cl)(=O)=O YBBRCQOCSYXUOC-UHFFFAOYSA-N 0.000 description 1
- 235000020357 syrup Nutrition 0.000 description 1
- 239000006188 syrup Substances 0.000 description 1
- 238000002211 ultraviolet spectrum Methods 0.000 description 1
- 239000000052 vinegar Substances 0.000 description 1
- 235000021419 vinegar Nutrition 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/126—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a diaphragm, bellows, or the like
- F16K31/1268—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a diaphragm, bellows, or the like with a plurality of the diaphragms
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C35/00—Permanently-installed equipment
- A62C35/58—Pipe-line systems
- A62C35/60—Pipe-line systems wet, i.e. containing extinguishing material even when not in use
- A62C35/605—Pipe-line systems wet, i.e. containing extinguishing material even when not in use operating and sounding alarm automatically
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/36—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor
- F16K31/363—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor the fluid acting on a piston
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Fluid-Driven Valves (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK105266A DK116842B (da) | 1966-03-01 | 1966-03-01 | Ventilarrangement til sprinkleranlæg. |
DK628066A DK122367B (da) | 1966-12-05 | 1966-12-05 | Styreventil til et ventilarrangement for et sprinkleranlæg. |
Publications (1)
Publication Number | Publication Date |
---|---|
NO121308B true NO121308B (xx) | 1971-02-08 |
Family
ID=26065135
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NO167065A NO121308B (xx) | 1966-03-01 | 1967-02-28 |
Country Status (7)
Country | Link |
---|---|
US (1) | US3451482A (xx) |
DE (1) | DE1708087A1 (xx) |
FI (1) | FI42801B (xx) |
GB (1) | GB1173088A (xx) |
NL (1) | NL6703303A (xx) |
NO (1) | NO121308B (xx) |
SE (1) | SE324107B (xx) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110253395A1 (en) * | 2006-12-15 | 2011-10-20 | Long Robert A | Non-Differential Dry Pipe Valve and Fire Suppression System and Method Thereof |
US10596401B2 (en) | 2016-08-11 | 2020-03-24 | Victaulic Company | Modular valve assembly |
US20180193681A1 (en) | 2017-01-06 | 2018-07-12 | Globe Fire Sprinkler Corporation | Control valve assembly with test, drain and adjustable pressure relief valve |
MX2020010222A (es) | 2018-03-29 | 2021-01-15 | Victaulic Co Of America | Ensamble de válvula de retención y control de combinación para un sistema de tuberías húmedas. |
WO2021055730A1 (en) | 2019-09-20 | 2021-03-25 | Victaulic Company | Ball valve assembly |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US480747A (en) * | 1892-08-16 | Sprinkler system |
-
1967
- 1967-02-22 GB GB8564/67A patent/GB1173088A/en not_active Expired
- 1967-02-23 SE SE2535/67A patent/SE324107B/xx unknown
- 1967-02-24 DE DE19671708087 patent/DE1708087A1/de active Pending
- 1967-02-27 US US618904A patent/US3451482A/en not_active Expired - Lifetime
- 1967-02-27 FI FI0576/67A patent/FI42801B/fi active
- 1967-02-28 NO NO167065A patent/NO121308B/no unknown
- 1967-02-28 NL NL6703303A patent/NL6703303A/xx unknown
Also Published As
Publication number | Publication date |
---|---|
FI42801B (xx) | 1970-06-30 |
DE1708087A1 (de) | 1971-02-25 |
SE324107B (xx) | 1970-05-19 |
US3451482A (en) | 1969-06-24 |
NL6703303A (xx) | 1967-09-04 |
GB1173088A (en) | 1969-12-03 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2183589A (en) | Derivatives of compounds of the | |
Baer et al. | Synthesis of a homologous series of optically active normal aliphatic α-monoglycerides (L-series) | |
Fletcher Jr et al. | 1, 5-Anhydro-xylitol | |
Jeanloz et al. | 1, 5-Anhydroribitol | |
NO121308B (xx) | ||
Wintersteiner et al. | The Preparation and Properties of the 7-Epimeric Cholestanediols-3 (β), 7 | |
NO750294L (xx) | ||
DE3405663A1 (de) | Verfahren zur herstellung von scyllo-inosit | |
Chang et al. | Seroflocculating steroids. III. 1 Chloro and other bile acid derivatives2 | |
Daubert | Preparation of Fatty Acid beta-Monoglycerides | |
PL72564B1 (en) | Resolution process[us3646118a] | |
DE2167180B1 (de) | Methyl-7-desoxy-7(S)-methoxy-alpha-thiolincosaminid und Verfahren zu dessen Herstellung | |
Montgomery et al. | Three Crystalline Hexaacetates of d-α-Mannoheptose1 | |
US2838552A (en) | New chloramphenicol esters and method of synthesizing same | |
Clutterbuck et al. | Studies in the Biochemistry of Micro-organisms. Part XVI—On the production from Glucose by Penicillium Spiculisporum Lehman of a new polybasic fatty acid, C17 H28 O6 (the lactone of γ-hydroxy-βδ-dicarboxypentadecoic acid) | |
ES2200327T3 (es) | Procedimiento para la obtencion de alcoholes grasos insaturados con un comportamiento mejorado en frio. | |
Robbins et al. | Some fully acetylated sugar acids and their derivatives | |
US2798879A (en) | 19-nortestosterone acylates and 3-enol acylates thereof | |
Ikan et al. | Synthesis of. beta.-sitosteryl acetate [(24 R)-24-ethyl-3. beta.-acetoxycholest-5-ene] and its 24 S epimer | |
US2693475A (en) | Process for preparing precalciferol | |
US3382251A (en) | Benzylidenic derivatives of substituted gamma-lactones and their process of preparation | |
US2855412A (en) | 16-iodoestrone ethers and esters | |
Pacsu | Studies in the ketone sugar series. I. A novel form of stereoisomerism in the sugar group. The acetyl and halogeno-acetyl derivatives of turanose1 | |
US2103522A (en) | Therapeutic composition | |
US2540307A (en) | 3, 4-diethoxymandelic acid and process for preparing same |