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Carboxylic acid

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Organic compound » Carboxylic acid
Acid » Carboxylic acid
Collapsed list Selected category: Carboxylic acid with all child subcategories
Total count of records found: 739. Showed records: 20.

481. Oxaluric acid

Molecular formula: C3H4N2O4 CAS# 585-05-7
Categories: Carboxylic acid , Ureas
Names
English:
(Carbamoylamino)(oxo)acetic acid(IUPAC)
;
2-(carbamoylamino)-2-oxoacetic acid(IUPAC)
;
3-OXALURIC ACID
;
Acetic acid, 2-[(aminocarbonyl)amino]-2-oxo-(CAS)
;
Carbamoyloxamic acid
;
Monooxalylurea
;
Oxaluric acid
;
Русский:
Оксалуровая кислота
;
моноуреид щавелевой кислоты
;
German:
(Carbamoylamino)(oxo)essigsäure(IUPAC)
;
French:
Acide (carbamoylamino)(oxo)acétique(IUPAC)
;
H2N/`|O|\N<_(y.5)H>/`|O|\|O`|/OH
H2NCONHCOCOOH

482. Oxamic Acid

Molecular formula: C2H3NO3 CAS# 471-47-6
Categories: Amide , Carboxylic acid
Names
English:
Oxamic Acid
;
acetic acid, 2-amino-2-oxo-(CAS)
;
Русский:
Оксаминовая кислота
;
моноамид щавелевой кислоты
;
French:
Acide amino(oxo)acétique(IUPAC)
;
German:
Amino(oxo)essigsäure(IUPAC)
;
H2N\|O`|/`|O|\OH
H2N/<`\\O>-<\OH>//O
H2NCOCOOH

483. Olivetolic acid

Molecular formula: C12H16O4 CAS# 491-72-5
Categories: Phenolic acid
Names
English:
2,4-dihydroxy-6-pentylbenzoic acid(IUPAC)
;
6-pentyl-β-resorcylic acid
;
Allazetolcarboxylic acid
;
Olivetolcarboxylic acid
;
Olivetolic acid
;
benzoic acid, 2,4-dihydroxy-6-pentyl-
;
beta-Resorcyclic acid, 6-pentyl-
;
Русский:
2,4-дигидрокси-6-пентилбензойная кислота(IUPAC)
;
Оливетоловая кислота
;
OH|\|<\/\/\CH3>`//`\<`/HO>`||/\/`|O|\OH
\/\/\/\</OH>||`/<|OH>`\\`|/`|`\O\/OH

484. Opianic acid

Molecular formula: C10H10O5 CAS# 519-05-1
Names
English:
6-formyl-2,3-dimethoxybenzoic acid(IUPAC)
;
Opianic acid
;
benzoic acid, 6-formyl-2,3-dimethoxy-(CAS)
;
Русский:
6-формил-2,3-диметоксибензойная кислота
;
Опиановая кислота
;
German:
6-Formyl-2,3-dimethoxybenzoesäure(IUPAC)
;
French:
Acide 6-formyl-2,3-diméthoxybenzoïque(IUPAC)
;
OH`/`\O\|\|`//`\<`/O|CH3>`||<`\O`/H3C>/\/\O`\`|H
HO\<`//O>-/-\\`/<\O-CH3>`=<`/O\CH3>`\/`\`=O
O\\-\-<\O->//<-O/>`\`=`/\`/<\\O>`-HO

485. Orotate

Molecular formula: C5H3N2O4^- CAS# 73-97-2
Categories: Anion , Carboxylic acid
Names
English:
2,4-dioxo-1H-pyrimidine-6-carboxylate(IUPAC)
;
2,6-Dioxo-1,2,3,6-tetrahydro-4-pyrimidinecarboxylate(IUPAC)
;
4,5-dihydroorotate
;
4-Pyrimidinecarboxylato, 1,2,3,6-tetrahydro-2,6-dioxo-, ion(1-)(CAS)
;
4-Pyrimidinecarboxylicacid, 2,6-dihydroxy-, ion(1-) (8CI)
;
5,6-dihydroorotate
;
Orotate [Wiki]
;
Orotic acid ion(1-)
;
uracil-6-carboxylate
;
Русский:
2,6-диоксо-1,2,3,6-тетрагидро-4-пиримидинкарбоксилат(IUPAC)
;
Оротат [Wiki]
;
German:
2,6-Dioxo-1,2,3,6-tetrahydro-4-pyrimidincarboxylat(IUPAC)
;
Orotat [Wiki]
;
French:
2,6-Dioxo-1,2,3,6-tétrahydro-4-pyrimidinecarboxylate(IUPAC)
;
Orotate [Wiki]
;
Español:
Orotato [Wiki]
;
Italiano:
Orotato
;
Português:
Orotato [Wiki]
;
`/N<_(y.5)H>`\`/O/`|HN/`|O|\||\|O`|/O^-
`//`-<`//O>`\HN/<`\\O>-NH\-<\O^->//O
||`/|O`|`\HN`|`\O\/N<_(y-.5)H>\/CO2^-

486. Orsellinic acid

Molecular formula: C8H8O4 CAS# 480-64-8
Categories: Phenolic acid
Names
English:
2,4-dihydroxy-6-methylbenzoic acid(IUPAC)
;
4,6-Dihydroxy-o-toluic acid
;
480-64-8
;
6-Methyl-b-resorcylic Acid
;
Benzoic acid, 2,4-dihydroxy-6-methyl-
;
Orcinolcarboxylic Acid
;
Orsellic acid
;
Orsellinic acid [Wiki]
;
o-Orsellinic acid
;
Русский:
2,4-дигидрокси-6-метилбензойная кислота(IUPAC)
;
о-Орселлиновая кислота
;
German:
2,4-Dihydroxy-6-methyl-benzoesäure
;
2,4-Dihydroxy-6-methylbenzoesäure(IUPAC)
;
4,6-Dihydroxy-o-toluylsäure
;
6-Methyl-β-resorcylsäure
;
Orsellinsäure [Wiki]
;
o-Orsellinsäure
;
French:
Acide 2,4-dihydroxy-6-méthylbenzoïque(IUPAC)
;
Acide orsellinique [Wiki]
;
acide ortho-orsellinique
;
Español:
Ácido orselínico [Wiki]
;
ácido 2,4-dihidroxi-6-metilbenzoico
;
ácido o-orselínico
;
日本語:
オルセリン酸 [Wiki]
;
OH|\|<\CH3>`//`\<`/HO>`||/\/`|O|\OH
HO\/O`/|\|`//<|OH>`\`||<`\HO>/\/
`/<|OH>`\`|<`\HO>/\</CH3>|_o\/O`/|OH

487. Pantoic acid

Molecular formula: C6H12O4 CAS# 1112-33-0
Categories: Hydroxy acids
Names
English:
(2R)-2,4-Dihydroxy-3,3-dimethylbutanoic acid(IUPAC)
;
(R)-pantoic acid
;
D-Pantoic acid
;
Pantoic acid [Wiki]
;
Русский:
(2R)-2,4-дигидрокси-3,3-диметилбутановая кислота(IUPAC)
;
Пантовая кислота
;
Пантоевая кислота
;
German:
(2R)-2,4-Dihydroxy-3,3-dimethylbutansäure(IUPAC)
;
French:
Acide (2R)-2,4-dihydroxy-3,3-diméthylbutanoïque(IUPAC)
;
Acide pantoïque [Wiki]
;
Italiano:
Acido pantoico [Wiki]
;
acido (2R)-2,4-diidrossi-3,3-dimetilbutanoico(IUPAC)
;
acido α,γ-diidrossi-β,β-dimetilbutirrico
;
Português:
Ácido (2R)-2,4-diidroxi-3,3-dimetilbutanoico
;
Ácido pantoico [Wiki]
;
HO/\<_(A120)><_(A60)>/<`|wOH>\|O`|/OH
HO\/<_q4><_p4>/<`|wOH>\|O`|/OH
HO\/<_(A-120)H3C><_(A-60)CH3>\<|dOH>/`|O|\OH
OH|`/O/\<|wOH>/<`|></>\/OH

488. Paraconic Acid

Molecular formula: C5H6O4 CAS# 498-89-5
Categories: Carboxylic acid , Lactone
Names
English:
5-oxooxolane-3-carboxylic acid(IUPAC)
;
Hydroxymethylsuccinic Acid d-Lactone
;
Paraconic Acid
;
SureCN546967
;
Русский:
Параконовая кислота
;
тетрагидро-5-оксо-3-фуранкарбоновая кислота(IUPAC)
;
`-_q<_(a54,N2)O>_qO_q_q_(a54)<_qq6O>_p6OH
-_p<_(a-54,N2)O>_pO_p_p_(a-54)<_pp6O>_q6HO

489. alpha-Parinaric acid

Molecular formula: C18H28O2
Categories: Fatty acid
Names
English:
(9Z,11E,13E,15Z)-octadeca-9,11,13,15-tetraenoic acid
;
9,11,13,15-octadecatetraenoic acid, (9Z,11E,13E,15Z)-(CAS)
;
C18:4, n-3 cis, 5 cis, 7 trans, 9 trans
;
C18:4n-3,5,7,9
;
alpha-Parinaric acid [Wiki]
;
cis-parinaric acid
;
α-Parinaric acid
;
Русский:
(9Z,11E,13E,15Z)-октадека-9,11,13,15-тетраеновая кислота
;
Паринаровая кислота
;
German:
(9Z,11E,13E,15Z)-9,11,13,15-Octadecatetraensäure(IUPAC)
;
French:
Acide (9Z,11E,13E,15Z)-9,11,13,15-octadécatétraénoïque(IUPAC)
;
Acide parinarique [Wiki]
;
acide alpha-parinarique
;
HO|`/O/\|\|\|\|\\/\\/\\/\\|\
H3C/\//`|//`|//`|//\/\/\/\/`|O|\OH
$slope(40)/\=/\\/\\/=\/\/\/\/`|O|\OH

490. Penicillanic Acid

Molecular formula: C8H11NO3S CAS# 87-53-6
Names
English:
(2S,5R)-3,3-Dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid(IUPAC)
;
4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid, 3,3-dimethyl-7-oxo-, (2S,5R)-(CAS)
;
EINECS:201-750-3
;
Penicillanic Acid
;
Русский:
Пенициллановая кислота
;
German:
(2S,5R)-3,3-Dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptan-2-carbonsäure(IUPAC)
;
French:
Acide (2S,5R)-3,3-diméthyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylique(IUPAC)
;
H_(y1,d-)|N_q<_(a54,d+)<_q6OH>_pp6O>_q<\CH3></CH3>_qS_q`-|<_(a45,N2)O>-
H_(A10,w-)-N_p<_(a-54,w+)<_qq6O>_p6OH>_p<_(A60)><_(A120)>_pS_p`|-<_(A-45,N2)O>|
N`|/S\<_(a-20)CH3><_(a-100)CH3>|<\dCO2H>_#1`-<_(a-45,N2)O>`|-`|dH

491. Penicillic Acid

Molecular formula: C8H10O4
Categories: Keto acids , Oxo acids , Mycotoxins
Names
English:
(2Z)-3-Methoxy-5-methyl-4-oxo-2,5-hexadienoic acid(IUPAC)
;
(2Z)-3-methoxy-5-methyl-4-oxohexa-2,5-dienoic acid(IUPAC)
;
2,5-Hexadienoic acid, 3-methoxy-5-methyl-4-oxo-, (2Z)-(CAS)
;
Penicillic Acid
;
Русский:
(2Z)-3-метокси-5-метил-4-оксо-2,5-гексадиеновая кислота
;
Пенициллиновая кислота
;
German:
(2Z)-3-Methoxy-5-methyl-4-oxo-2,5-hexadiensäure(IUPAC)
;
French:
Acide (2Z)-3-méthoxy-5-méthyl-4-oxo-2,5-hexadiénoïque(IUPAC)
;
H3C\|CH2`|/`|O|\<|O\CH3>//\|O`|/OH
HO/`|O|\//<`|O`\>\|O`|/`|c|\

492. Pencillic acid

Molecular formula: C8H10O4
Categories: Keto acids , Oxo acids
Names
English:
(2E)-3-methoxy-5-methyl-4-oxohexa-2,5-dienoic acid
;
2,5-hexadienoic acid, 3-methoxy-5-methyl-4-oxo-, (2E)-(CAS)
;
EINECS:202-008-1
;
Pencillic acid
;
g-Keto-b-methoxy-d-methylene-Da-hexenoic Acid
;
gamma-Keto-beta-methoxy-delta-methylene-delta(sup alpha)-hexenoic acid
;
German:
(2E)-3-Methoxy-5-methyl-4-oxo-2,5-hexadiensäure(IUPAC)
;
French:
Acide (2E)-3-méthoxy-5-méthyl-4-oxo-2,5-hexadiénoïque(IUPAC)
;
Русский:
(2E)-3-метокси-5-метил-4-оксо-2,5-гексадиеновая кислота(IUPAC)
;
Пенициллиновая кислота(IUPAC)
;
\|`|/`|O|\<|O\>//`|`\O\/OH
H3C\<`//H2C>-<//O>\<`/O`-H3C>=/<`\\O>-OH

493. Penicillic Acid

Molecular formula: C8H10O4 CAS# 90-65-3
Categories: Keto acids , Oxo acids , Mycotoxins
Names
English:
2,5-Hexadienoic acid, 3-methoxy-5-methyl-4-oxo-
;
3-methoxy-5-methyl-4-oxohexa-2,5-dienoic acid(IUPAC)
;
Penicillic Acid
;
Русский:
3-метокси-5-метил-4-оксо-2,5-гексадиеновая кислота(IUPAC)
;
Пенициллиновая кислота
;
HO\|O`|/\\x<|O`/>/`|O|\|`|/
H3C-C<`||H2C>-C<`||O>-C<`|`OCH3>=CH-CO2H

494. Petroselinic acid

Molecular formula: C18H34O2 CAS# 593-39-5
Categories: Fatty acid
Names
English:
(6Z)-6-Octadecenoic acid(IUPAC)
;
(6Z)-Octadec-6-enoic acid
;
(6Z)-Octadecenoic acid
;
(Z)-6-Octadecenoic acid
;
(Z)-Octadec-6-enoic acid(IUPAC)
;
18:1 cis-6
;
6(Z)-Octadecenoic acid
;
6-Octadecenoicacid, (Z)- (8CI)
;
6-octadecenoic acid, (6Z)-(CAS)
;
D5-Octadecylenic Acid
;
D6-cis-Octadecenoic acid
;
EINECS:209-789-8
;
Petroselic acid
;
Petroselinic acid [Wiki]
;
Petroselinic acid (6CI)
;
cis-6-Octadecenoic acid
;
cis-D6-Octadecenoic acid
;
cis-Petroselinic acid
;
cis-Δ6 18:1 n-12
;
cis-Δ6-Octadecenoic acid
;
Русский:
Петрозелиновая кислота
;
Петроселиновая кислота
;
цис-6-октадеценовая кислота
;
German:
(6Z)-6-Octadecensäure(IUPAC)
;
Petroselinsäure [Wiki]
;
cis-6-Octadecensäure
;
French:
Acide (6Z)-6-octadécénoïque(IUPAC)
;
Acide pétrosélinique [Wiki]
;
H3C/\/\/\/\/\|\\/\/\/`|O|\OH
$slope(40)HO/`|O|\/\/\=/\/\/\/\/\/CH3
HO/\O`\`|/`|/`|//\/\/\/\/\/\
HO2C/{}_(x.01,N0,h)(CH2)4_(x.01,N0,h){}\_(x1,N2)/{}_(x.01,N0,h)(CH2)10_(x.01,N0,h){}\CH3

495. Picolinic acid

Molecular formula: C6H5NO2 CAS# 98-98-6
Names
English:
2-Carboxypyridine
;
2-Picolinic acid
;
2-Pyridinecarboxylic acid
;
EINECS:202-719-7
;
Picolinic acid [Wiki]
;
alpha-Picolinic acid
;
o-Pyridinecarboxylic acid
;
pyridine-2-carboxylic acid(IUPAC)
;
Русский:
Пиколиновая кислота
;
пиридин-2-карбоновая кислота(IUPAC)
;
German:
2-Pyridincarbonsäure(IUPAC)
;
Picolinsäure [Wiki]
;
Pyridin-2-carbonsäure
;
French:
Acide 2-pyridinecarboxylique(IUPAC)
;
Acide picolinique [Wiki]
;
acide picolique
;
acide pyridine-2-carboxylique
;
Italiano:
Acido picolinico [Wiki]
;
acido piridin-2-carbossilico
;
日本語:
ピコリン酸 [Wiki]
;
ピリジン-2-カルボン酸(IUPAC)
;
`/N`=`\//-\\-<//O>\OH
/`\\`-`//\N=\<=O>`/HO
HO\|O`|/\N//`|`\\`/||
|`//`\`||/N\\/CO2H
`/N`\`|/\|_o\|O`|/OH

496. Pimaric acid

Molecular formula: C20H30O2 CAS# 127-27-5
Categories: Carboxylic acid , Terpenoid
Names
English:
(1R,4aR,4bS,7S,10aR)-7-ethenyl-1,4a,7-trimethyl-3,4,4b,5,6,9,10,10a-octahydro-2H-phenanthrene-1-carboxylic acid(IUPAC)
;
(5ξ)-Pimara-8(14),15-dien-18-oic acid(IUPAC)
;
1-Phenanthrenecarboxylicacid, 7-ethenyl-1,2,3,4,4a,4b,5,6,7,9,10,10a-dodecahydro-1,4a,7-trimethyl-,[1R-(1a,4ab,4ba,7b,10aa)]-
;
1-phenanthrenecarboxylic acid, 7-ethenyl-1,2,3,4,4a,4b,5,6,7,9,10,10a-dodecahydro-1,4a,7-trimethyl-, (1R,4aR,4bS,7S)-(CAS)
;
13a-Methyl-13-vinylpodocarp-8(14)-en-15-oicacid
;
13a-methyl-13-vinylpodocarp-8(14)-ene-15-oic acid
;
8(14),15-Pimaradien-18-oic acid
;
D8(14)-Pimaric acid
;
Dextropimaric acid
;
Pimara-8(14),15-dien-19-oic acid
;
Pimaric acid [Wiki]
;
Podocarp-8(14)-en-15-oic acid, 13a-methyl-13-vinyl- (7CI,8CI)
;
a-Pimaric Acid
;
d-Pimaric acid
;
α-Pimaric acid
;
Русский:
(4aR)-7c-винил-1,2,3,4,4ar,4bt,5,6,7,9,10at-додекагидро-1c,4,7t-триметил-фенантренкарбоновая кислота(IUPAC)
;
Пимаровая кислота [Wiki]
;
German:
(1R,4aR,4bS,7S,10aR)-7-Ethenyl-1,2,3,4,4a,4b,5,6,7,9,10,10a-dodecahydro-1,4a,7-trimethyl-1-phenanthrencarbonsäure
;
(5ξ)-Pimara-8(14),15-dien-18-säure(IUPAC)
;
Pimarsäure [Wiki]
;
French:
Acide (5ξ)-pimara-8(14),15-dién-18-oïque(IUPAC)
;
Acide pimarique [Wiki]
;
acide (1R,4aR,4bS,7S,10aR)-7-éthényl-1,4a,7-triméthyl-3,4,4b,5,6,9,10,10a-octahydro-2H-phénanthrène-1-carboxylique
;
`/<_(A60,d+)<-OH>_(A120,N2)O><_(A120,w+)H3C>`\`|/\|<|dH>\/`|`\<|dH><`/`|wH3C>`|/\<_(a-90,w+)=CH2><_(a-30,d+)CH3>|`//
H_(y-.8,d-)`/<_(A60,d+)COOH><_(A120,w+)>`\`|/\|\/`|//`|<\d></w`||>`\`/|<\><|dH>`/`|w

497. Pimelic acid

Molecular formula: C7H12O4 CAS# 111-16-0
Categories: Carboxylic acid
Names
English:
Pimelic acid [Wiki]
;
heptanedioic acid(IUPAC)
;
Русский:
Пимелиновая кислота [Wiki]
;
гептандиовая кислота(IUPAC)
;
German:
1,5-Pentandicarbonsäure
;
Heptandisäure
;
Pimelinsäure [Wiki]
;
العربية:
حمض البيميليك [Wiki]
;
Español:
Ácido pimélico [Wiki]
;
ácido heptanodioico
;
ácido pentano-1,5-dicarboxílico
;
French:
Acide pimélique [Wiki]
;
acide heptanedioïque
;
日本語:
ピメリン酸 [Wiki]
;
Português:
Ácido pimélico [Wiki]
;
ácido heptanodioico(IUPAC)
;
HO/`|O|\/\/\/`|O|\OH
HOOC(CH2)5COOH
HO2C(CH2)5CO2H
O=</OH>\`/\`/\`/<\\O>`-HO
C5H10(COOH)2

498. 3-(Carboxymethyl)-2,2-dimethylcyclobutanecarboxylic acid

Molecular formula: C9H14O4 CAS# 28664-02-0
Names
English:
3-(Carboxymethyl)-2,2-dimethylcyclobutanecarboxylic acid(IUPAC)
;
3-(carboxymethyl)-2,2-dimethylcyclobutane-1-carboxylic acid(IUPAC)
;
3-Carboxy-2,2-dimethylcyclobutanacetic Acid
;
cyclobutaneacetic acid, 3-carboxy-2,2-dimethyl-(CAS)
;
pinic acid
;
Русский:
3-карбокси-2,2-диметилциклобутануксусная кислота(IUPAC)
;
Пиновая кислота
;
French:
Acide 3-(carboxyméthyl)-2,2-diméthylcyclobutanecarboxylique(IUPAC)
;
Acide pinique [Wiki]
;
acide 3-(carboxyméthyl)-2,2-diméthylcyclobutane-1-carboxylique(IUPAC)
;
German:
3-(Carboxymethyl)-2,2-dimethylcyclobutancarbonsäure(IUPAC)
;
O\\<`/HO>-_(A45)_q4<-/<`\\O>-OH>_q4<_(A-60)><_(A-120)>_q4
$slope(45)CH3`-|<\<_qq6O>_p6HO>`-`|<`\_q6<_qq6O>_p6HO>-`|CH3
`-|$slope(45)<`/HO2C>-<|CH3><-CH3>`|/CH2-CO2H

499. Pinolenic acid

Molecular formula: C18H30O2 CAS# 16833-54-8
Categories: Fatty acid
Names
English:
(5Z,9Z,12Z)-octadeca-5,9,12-trienoic acid(IUPAC)
;
5,9,12-Octadecatrienoicacid, (5Z,9Z,12Z)-(CAS)
;
Pinolenic acid [Wiki]
;
pinoleic acid
;
Русский:
(5Z,9Z,12Z)-октадека-5,9,12-триеновая кислота(IUPAC)
;
Пиноленовая кислота [Wiki]
;
цис,цис,цис-5,9,12-октадекатриеновая кислота
;
цис-5,9,12-октадекатриеновая кислота
;
French:
Acide pinolénique [Wiki]
;
acide (5Z,9Z,12Z)-octadéca-5,9,12-triénoïque(IUPAC)
;
acide pinoléique
;
|\|\|\\/\//`|/`|//\/\/`|O|\OH
$slope(50)H3C/{}_(x.01,h)(CH2)4_(x.01,h){}\=/\=/\/=\{}_(x.01,h)(CH2)3_(x.01,h){}/CO2H

500. Pinonic acid

Molecular formula: C10H16O3 CAS# 473-72-3
Names
English:
(3-acetyl-2,2-dimethylcyclobutyl)acetic acid(IUPAC)
;
2-(3-acetyl-2,2-dimethylcyclobutyl)acetic acid(IUPAC)
;
EINECS:207-471-3
;
Pinonic acid
;
cyclobutaneacetic acid, 3-acetyl-2,2-dimethyl-(CAS)
;
Русский:
3-ацетил-2,2-диметилциклобутануксусная кислота(IUPAC)
;
Пиноновая кислота
;
German:
(3-Acetyl-2,2-dimethylcyclobutyl)essigsäure(IUPAC)
;
French:
Acide (3-acétyl-2,2-diméthylcyclobutyl)acétique(IUPAC)
;
HO/`|O|\/_(A45)_q4<\|O`|/CH3>_q4<_(A-60)CH3><_(A-120)H3C>_q4
CH3`-|<_(A45)<_qq6O>_p6HO>`-`|<-`|CH3>_(A-135)_q6<_qq6O>_p6H3C
$slope(45)|<-{Me}><|{Me}>`-<`/{Ac}>`|-/CH2-CO2H