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    首页 分子通 按分子结构分类 有机化合物 苯丙烷和聚酮

    苯丙烷和聚酮

    下级分类

    中文名称 英文名称 CAS号 化学式 结构式图片
    —— 2-[(3S,6R)-3-tert-butyl-5,14-dioxo-1-oxa-4-azacyclotetradec-8-en-6-yl]-N-[(2S)-1-hydroxypropan-2-yl]acetamide —— C21H36N2O5
    2-[(3S,6R)-3-tert-butyl-5,14-dioxo-1-oxa-4-azacyclotetradec-8-en-6-yl]-N-[(2S)-1-hydroxypropan-2-yl]acetamide
    —— 2-[(3R,6R)-3-(benzylsulfanylmethyl)-5,14-dioxo-1-oxa-4-azacyclotetradec-8-en-6-yl]-N-[1-(hydroxymethyl)cyclopentyl]acetamide —— C28H40N2O5S
    2-[(3R,6R)-3-(benzylsulfanylmethyl)-5,14-dioxo-1-oxa-4-azacyclotetradec-8-en-6-yl]-N-[1-(hydroxymethyl)cyclopentyl]acetamide
    —— 2-[(3S,6R,13R)-3,13-dibenzyl-5,14-dioxo-1-oxa-4-azacyclotetradec-8-en-6-yl]-N-[(2S)-1-hydroxy-3-(4-phenylmethoxyphenyl)propan-2-yl]acetamide —— C44H50N2O6
    2-[(3S,6R,13R)-3,13-dibenzyl-5,14-dioxo-1-oxa-4-azacyclotetradec-8-en-6-yl]-N-[(2S)-1-hydroxy-3-(4-phenylmethoxyphenyl)propan-2-yl]acetamide
    —— 2-[(3S,6R)-5,14-dioxo-3-phenyl-1-oxa-4-azacyclotetradec-8-en-6-yl]-N-[(2S)-1-hydroxy-3-phenylpropan-2-yl]acetamide —— C29H36N2O5
    2-[(3S,6R)-5,14-dioxo-3-phenyl-1-oxa-4-azacyclotetradec-8-en-6-yl]-N-[(2S)-1-hydroxy-3-phenylpropan-2-yl]acetamide
    —— benzyl N-[4-[(3S,6R)-6-[2-[[1-(hydroxymethyl)cyclopentyl]amino]-2-oxoethyl]-5,14-dioxo-1-oxa-4-azacyclotetradec-8-en-3-yl]butyl]carbamate —— C32H47N3O7
    benzyl N-[4-[(3S,6R)-6-[2-[[1-(hydroxymethyl)cyclopentyl]amino]-2-oxoethyl]-5,14-dioxo-1-oxa-4-azacyclotetradec-8-en-3-yl]butyl]carbamate
    —— (3S,6R)-6-[2-[[(2S)-1-hydroxy-3-phenylpropan-2-yl]amino]-2-oxoethyl]-N-naphthalen-2-yl-5,13-dioxo-1-oxa-4-azacyclotridec-8-ene-3-carboxamide —— C33H37N3O6
    (3S,6R)-6-[2-[[(2S)-1-hydroxy-3-phenylpropan-2-yl]amino]-2-oxoethyl]-N-naphthalen-2-yl-5,13-dioxo-1-oxa-4-azacyclotridec-8-ene-3-carboxamide
    —— (2S,6R,12R)-12-benzyl-6-[2-[(2S)-2-(hydroxymethyl)pyrrolidin-1-yl]-2-oxoethyl]-2-methyl-1-oxa-4-azacyclotridec-8-ene-5,13-dione —— C26H36N2O5
    (2S,6R,12R)-12-benzyl-6-[2-[(2S)-2-(hydroxymethyl)pyrrolidin-1-yl]-2-oxoethyl]-2-methyl-1-oxa-4-azacyclotridec-8-ene-5,13-dione
    —— 2-[(2S,6R)-5,13-dioxo-2-phenyl-1-oxa-4-azacyclotridec-8-en-6-yl]-N-[(2S)-1-hydroxy-3-(4-phenylmethoxyphenyl)propan-2-yl]acetamide —— C35H40N2O6
    2-[(2S,6R)-5,13-dioxo-2-phenyl-1-oxa-4-azacyclotridec-8-en-6-yl]-N-[(2S)-1-hydroxy-3-(4-phenylmethoxyphenyl)propan-2-yl]acetamide
    —— 2-[(3S,6R,13R)-13-benzyl-5,14-dioxo-3-propan-2-yl-1-oxa-4-azacyclotetradec-8-en-6-yl]-N-[(2R)-1-hydroxy-3-phenylpropan-2-yl]acetamide —— C33H44N2O5
    2-[(3S,6R,13R)-13-benzyl-5,14-dioxo-3-propan-2-yl-1-oxa-4-azacyclotetradec-8-en-6-yl]-N-[(2R)-1-hydroxy-3-phenylpropan-2-yl]acetamide
    —— N-benzyl-2-[(3S,6R,13R)-13-benzyl-3-(cyclohexylmethyl)-5,14-dioxo-1-oxa-4-azacyclotetradec-8-en-6-yl]-N-(2-hydroxyethyl)acetamide —— C37H50N2O5
    N-benzyl-2-[(3S,6R,13R)-13-benzyl-3-(cyclohexylmethyl)-5,14-dioxo-1-oxa-4-azacyclotetradec-8-en-6-yl]-N-(2-hydroxyethyl)acetamide
    —— 2-[(2S,6R,12R)-12-benzyl-5,13-dioxo-2-phenyl-1-oxa-4-azacyclotridec-8-en-6-yl]-N-[(2R)-1-hydroxypropan-2-yl]acetamide —— C29H36N2O5
    2-[(2S,6R,12R)-12-benzyl-5,13-dioxo-2-phenyl-1-oxa-4-azacyclotridec-8-en-6-yl]-N-[(2R)-1-hydroxypropan-2-yl]acetamide
    —— (3S,6R)-6-[2-[[(2R)-1-hydroxypropan-2-yl]amino]-2-oxoethyl]-N-naphthalen-2-yl-5,13-dioxo-1-oxa-4-azacyclotridec-8-ene-3-carboxamide —— C27H33N3O6
    (3S,6R)-6-[2-[[(2R)-1-hydroxypropan-2-yl]amino]-2-oxoethyl]-N-naphthalen-2-yl-5,13-dioxo-1-oxa-4-azacyclotridec-8-ene-3-carboxamide
    —— 2-[(3S,6R)-5,14-dioxo-3-(phenylmethoxymethyl)-1-oxa-4-azacyclotetradec-8-en-6-yl]-N-[2-(2-hydroxyethoxy)ethyl]acetamide —— C26H38N2O7
    2-[(3S,6R)-5,14-dioxo-3-(phenylmethoxymethyl)-1-oxa-4-azacyclotetradec-8-en-6-yl]-N-[2-(2-hydroxyethoxy)ethyl]acetamide
    —— N-benzyl-2-[(2S,3S,6R,11S)-11-benzyl-3-(methoxymethyl)-5,12-dioxo-2-phenyl-1-oxa-4-azacyclododec-8-en-6-yl]-N-(2-hydroxyethyl)acetamide —— C36H42N2O6
    N-benzyl-2-[(2S,3S,6R,11S)-11-benzyl-3-(methoxymethyl)-5,12-dioxo-2-phenyl-1-oxa-4-azacyclododec-8-en-6-yl]-N-(2-hydroxyethyl)acetamide
    —— 2-[(2S,6R)-5,13-dioxo-2-phenyl-1-oxa-4-azacyclotridec-8-en-6-yl]-N-[(2S)-1-hydroxy-3-phenylpropan-2-yl]acetamide —— C28H34N2O5
    2-[(2S,6R)-5,13-dioxo-2-phenyl-1-oxa-4-azacyclotridec-8-en-6-yl]-N-[(2S)-1-hydroxy-3-phenylpropan-2-yl]acetamide
    —— 2-[(3R,13S)-2,10-dioxo-11-oxa-1-azabicyclo[11.3.0]hexadec-5-en-3-yl]-N-[(2S)-1-hydroxy-3-phenylpropan-2-yl]acetamide —— C25H34N2O5
    2-[(3R,13S)-2,10-dioxo-11-oxa-1-azabicyclo[11.3.0]hexadec-5-en-3-yl]-N-[(2S)-1-hydroxy-3-phenylpropan-2-yl]acetamide
    —— 2-[(2S,6R,13R)-13-benzyl-2-methyl-5,14-dioxo-1-oxa-4-azacyclotetradec-8-en-6-yl]-N-[(2S)-1-hydroxy-3-(4-phenylmethoxyphenyl)propan-2-yl]acetamide —— C38H46N2O6
    2-[(2S,6R,13R)-13-benzyl-2-methyl-5,14-dioxo-1-oxa-4-azacyclotetradec-8-en-6-yl]-N-[(2S)-1-hydroxy-3-(4-phenylmethoxyphenyl)propan-2-yl]acetamide
    —— 2-[(3S,6R,12R)-12-benzyl-3-tert-butyl-5,13-dioxo-1-oxa-4-azacyclotridec-8-en-6-yl]-N-[(2S)-1-hydroxy-3-phenylpropan-2-yl]acetamide —— C33H44N2O5
    2-[(3S,6R,12R)-12-benzyl-3-tert-butyl-5,13-dioxo-1-oxa-4-azacyclotridec-8-en-6-yl]-N-[(2S)-1-hydroxy-3-phenylpropan-2-yl]acetamide
    —— 2-[(2S,6R,12R)-12-benzyl-2-methyl-5,13-dioxo-1-oxa-4-azacyclotridec-8-en-6-yl]-N-[(2S)-1-hydroxypropan-2-yl]acetamide —— C24H34N2O5
    2-[(2S,6R,12R)-12-benzyl-2-methyl-5,13-dioxo-1-oxa-4-azacyclotridec-8-en-6-yl]-N-[(2S)-1-hydroxypropan-2-yl]acetamide
    —— N-[(2R)-1-hydroxy-3-phenylpropan-2-yl]-2-[(3S,6R)-3-methyl-5,14-dioxo-1-oxa-4-azacyclotetradec-8-en-6-yl]acetamide —— C24H34N2O5
    N-[(2R)-1-hydroxy-3-phenylpropan-2-yl]-2-[(3S,6R)-3-methyl-5,14-dioxo-1-oxa-4-azacyclotetradec-8-en-6-yl]acetamide
    —— 2-[(3S,6R)-3-benzyl-5,14-dioxo-1-oxa-4-azacyclotetradec-8-en-6-yl]-N-[1-(hydroxymethyl)cyclopentyl]acetamide —— C27H38N2O5
    2-[(3S,6R)-3-benzyl-5,14-dioxo-1-oxa-4-azacyclotetradec-8-en-6-yl]-N-[1-(hydroxymethyl)cyclopentyl]acetamide
    —— 2-[(3S,6R,13R)-3,13-dibenzyl-5,14-dioxo-1-oxa-4-azacyclotetradec-8-en-6-yl]-N-[(2S)-1-hydroxypropan-2-yl]acetamide —— C31H40N2O5
    2-[(3S,6R,13R)-3,13-dibenzyl-5,14-dioxo-1-oxa-4-azacyclotetradec-8-en-6-yl]-N-[(2S)-1-hydroxypropan-2-yl]acetamide
    —— 2-[(3R,6R,12R)-3,12-dibenzyl-5,13-dioxo-1-oxa-4-azacyclotridec-8-en-6-yl]-N-[(2R)-1-hydroxypropan-2-yl]acetamide —— C30H38N2O5
    2-[(3R,6R,12R)-3,12-dibenzyl-5,13-dioxo-1-oxa-4-azacyclotridec-8-en-6-yl]-N-[(2R)-1-hydroxypropan-2-yl]acetamide
    —— N-[(2S)-1-hydroxypropan-2-yl]-2-[(2S,6R)-2-methyl-5,13-dioxo-1-oxa-4-azacyclotridec-8-en-6-yl]acetamide —— C17H28N2O5
    N-[(2S)-1-hydroxypropan-2-yl]-2-[(2S,6R)-2-methyl-5,13-dioxo-1-oxa-4-azacyclotridec-8-en-6-yl]acetamide
    —— 2-[(3S,6R)-5,13-dioxo-3-propan-2-yl-1-oxa-4-azacyclotridec-8-en-6-yl]-N-[2-(2-hydroxyethoxy)ethyl]acetamide —— C20H34N2O6
    2-[(3S,6R)-5,13-dioxo-3-propan-2-yl-1-oxa-4-azacyclotridec-8-en-6-yl]-N-[2-(2-hydroxyethoxy)ethyl]acetamide
    —— N-[2-(2-hydroxyethoxy)ethyl]-2-[(3S,6R)-3-methyl-5,14-dioxo-1-oxa-4-azacyclotetradec-8-en-6-yl]acetamide —— C19H32N2O6
    N-[2-(2-hydroxyethoxy)ethyl]-2-[(3S,6R)-3-methyl-5,14-dioxo-1-oxa-4-azacyclotetradec-8-en-6-yl]acetamide
    —— 2-[(3S,6R,11R)-11-benzyl-5,12-dioxo-3-propan-2-yl-1-oxa-4-azacyclododec-8-en-6-yl]-N-[(2S)-1-hydroxy-3-phenylpropan-2-yl]acetamide —— C31H40N2O5
    2-[(3S,6R,11R)-11-benzyl-5,12-dioxo-3-propan-2-yl-1-oxa-4-azacyclododec-8-en-6-yl]-N-[(2S)-1-hydroxy-3-phenylpropan-2-yl]acetamide
    —— 2-[(6R,11R)-11-benzyl-5,12-dioxo-1-oxa-4-azacyclododec-8-en-6-yl]-N-[(2S)-1-hydroxypropan-2-yl]acetamide —— C22H30N2O5
    2-[(6R,11R)-11-benzyl-5,12-dioxo-1-oxa-4-azacyclododec-8-en-6-yl]-N-[(2S)-1-hydroxypropan-2-yl]acetamide
    —— 2-[(3S,6R)-5,13-dioxo-3-propan-2-yl-1-oxa-4-azacyclotridec-8-en-6-yl]-N-[(2S)-1-hydroxy-3-phenylpropan-2-yl]acetamide —— C25H36N2O5
    2-[(3S,6R)-5,13-dioxo-3-propan-2-yl-1-oxa-4-azacyclotridec-8-en-6-yl]-N-[(2S)-1-hydroxy-3-phenylpropan-2-yl]acetamide
    —— 2-[(3S,6R,11S)-11-benzyl-5,12-dioxo-3-phenyl-1-oxa-4-azacyclododec-8-en-6-yl]-N-[(2R)-1-hydroxy-3-phenylpropan-2-yl]acetamide —— C34H38N2O5
    2-[(3S,6R,11S)-11-benzyl-5,12-dioxo-3-phenyl-1-oxa-4-azacyclododec-8-en-6-yl]-N-[(2R)-1-hydroxy-3-phenylpropan-2-yl]acetamide
    —— benzyl N-[(3S,6R,11R)-3-tert-butyl-6-[2-[[(2R)-1-hydroxypropan-2-yl]amino]-2-oxoethyl]-5,12-dioxo-1-oxa-4-azacyclododec-8-en-11-yl]carbamate —— C27H39N3O7
    benzyl N-[(3S,6R,11R)-3-tert-butyl-6-[2-[[(2R)-1-hydroxypropan-2-yl]amino]-2-oxoethyl]-5,12-dioxo-1-oxa-4-azacyclododec-8-en-11-yl]carbamate
    —— 2-[(6R)-3,3-dimethyl-5,13-dioxo-1-oxa-4-azacyclotridec-8-en-6-yl]-N-[(2R)-1-hydroxy-3-phenylpropan-2-yl]acetamide —— C24H34N2O5
    2-[(6R)-3,3-dimethyl-5,13-dioxo-1-oxa-4-azacyclotridec-8-en-6-yl]-N-[(2R)-1-hydroxy-3-phenylpropan-2-yl]acetamide
    —— N-[(2R)-1-hydroxy-3-phenylpropan-2-yl]-2-[(3S,6R)-3-(1H-indol-3-ylmethyl)-5,13-dioxo-1-oxa-4-azacyclotridec-8-en-6-yl]acetamide —— C31H37N3O5
    N-[(2R)-1-hydroxy-3-phenylpropan-2-yl]-2-[(3S,6R)-3-(1H-indol-3-ylmethyl)-5,13-dioxo-1-oxa-4-azacyclotridec-8-en-6-yl]acetamide
    —— N-benzyl-2-[(3S,6R,12R)-12-benzyl-5,13-dioxo-3-(phenylmethoxymethyl)-1-oxa-4-azacyclotridec-8-en-6-yl]-N-(2-hydroxyethyl)acetamide —— C37H44N2O6
    N-benzyl-2-[(3S,6R,12R)-12-benzyl-5,13-dioxo-3-(phenylmethoxymethyl)-1-oxa-4-azacyclotridec-8-en-6-yl]-N-(2-hydroxyethyl)acetamide
    —— benzyl N-[(3R,6R,11R)-3-(benzylsulfanylmethyl)-6-[2-[(2S)-2-(hydroxymethyl)pyrrolidin-1-yl]-2-oxoethyl]-5,12-dioxo-1-oxa-4-azacyclododec-8-en-11-yl]carbamate —— C33H41N3O7S
    benzyl N-[(3R,6R,11R)-3-(benzylsulfanylmethyl)-6-[2-[(2S)-2-(hydroxymethyl)pyrrolidin-1-yl]-2-oxoethyl]-5,12-dioxo-1-oxa-4-azacyclododec-8-en-11-yl]carbamate
    —— 2-[(2R,6R,11R)-11-benzyl-5,12-dioxo-2-phenyl-1-oxa-4-azacyclododec-8-en-6-yl]-N-[2-(2-hydroxyethoxy)ethyl]acetamide —— C29H36N2O6
    2-[(2R,6R,11R)-11-benzyl-5,12-dioxo-2-phenyl-1-oxa-4-azacyclododec-8-en-6-yl]-N-[2-(2-hydroxyethoxy)ethyl]acetamide
    —— 2-[(3S,6R)-3-(cyclohexylmethyl)-5,14-dioxo-1-oxa-4-azacyclotetradec-8-en-6-yl]-N-[(2S)-1-hydroxypropan-2-yl]acetamide —— C24H40N2O5
    2-[(3S,6R)-3-(cyclohexylmethyl)-5,14-dioxo-1-oxa-4-azacyclotetradec-8-en-6-yl]-N-[(2S)-1-hydroxypropan-2-yl]acetamide
    —— (3S,6R)-6-[2-[(3S)-3-(hydroxymethyl)-3,4-dihydro-1H-isoquinolin-2-yl]-2-oxoethyl]-3-propan-2-yl-1-oxa-4-azacyclotridec-8-ene-5,13-dione —— C26H36N2O5
    (3S,6R)-6-[2-[(3S)-3-(hydroxymethyl)-3,4-dihydro-1H-isoquinolin-2-yl]-2-oxoethyl]-3-propan-2-yl-1-oxa-4-azacyclotridec-8-ene-5,13-dione
    —— 2-[(3S,6R)-5,14-dioxo-3-propan-2-yl-1-oxa-4-azacyclotetradec-8-en-6-yl]-N-[2-(2-hydroxyethoxy)ethyl]acetamide —— C21H36N2O6
    2-[(3S,6R)-5,14-dioxo-3-propan-2-yl-1-oxa-4-azacyclotetradec-8-en-6-yl]-N-[2-(2-hydroxyethoxy)ethyl]acetamide
    —— N-benzyl-2-[(3R,8S,12S)-8-benzyl-2,9-dioxo-10-oxa-1-azabicyclo[10.3.0]pentadec-5-en-3-yl]-N-(2-hydroxyethyl)acetamide —— C31H38N2O5
    N-benzyl-2-[(3R,8S,12S)-8-benzyl-2,9-dioxo-10-oxa-1-azabicyclo[10.3.0]pentadec-5-en-3-yl]-N-(2-hydroxyethyl)acetamide
    —— benzyl (3R,6R,11R)-6-[2-[[1-(hydroxymethyl)cyclopentyl]amino]-2-oxoethyl]-5,12-dioxo-11-(phenylmethoxycarbonylamino)-1-oxa-4-azacyclododec-8-ene-3-carboxylate —— C34H41N3O9
    benzyl (3R,6R,11R)-6-[2-[[1-(hydroxymethyl)cyclopentyl]amino]-2-oxoethyl]-5,12-dioxo-11-(phenylmethoxycarbonylamino)-1-oxa-4-azacyclododec-8-ene-3-carboxylate
    —— 2-[(3S,6R)-5,12-dioxo-3-phenyl-1-oxa-4-azacyclododec-8-en-6-yl]-N-[(2S)-1-hydroxypropan-2-yl]acetamide —— C21H28N2O5
    2-[(3S,6R)-5,12-dioxo-3-phenyl-1-oxa-4-azacyclododec-8-en-6-yl]-N-[(2S)-1-hydroxypropan-2-yl]acetamide
    —— (2S,6R,12R)-12-benzyl-6-[2-[(3S)-3-(hydroxymethyl)-3,4-dihydro-1H-isoquinolin-2-yl]-2-oxoethyl]-2-phenyl-1-oxa-4-azacyclotridec-8-ene-5,13-dione —— C36H40N2O5
    (2S,6R,12R)-12-benzyl-6-[2-[(3S)-3-(hydroxymethyl)-3,4-dihydro-1H-isoquinolin-2-yl]-2-oxoethyl]-2-phenyl-1-oxa-4-azacyclotridec-8-ene-5,13-dione
    —— (3S,6R,12R)-12-benzyl-6-[2-[[(2S)-1-hydroxy-3-(4-phenylmethoxyphenyl)propan-2-yl]amino]-2-oxoethyl]-N-naphthalen-2-yl-5,13-dioxo-1-oxa-4-azacyclotridec-8-ene-3-carboxamide —— C47H49N3O7
    (3S,6R,12R)-12-benzyl-6-[2-[[(2S)-1-hydroxy-3-(4-phenylmethoxyphenyl)propan-2-yl]amino]-2-oxoethyl]-N-naphthalen-2-yl-5,13-dioxo-1-oxa-4-azacyclotridec-8-ene-3-carboxamide
    —— benzyl N-[4-[(3S,6R)-6-[2-[[(2R)-1-hydroxypropan-2-yl]amino]-2-oxoethyl]-5,14-dioxo-1-oxa-4-azacyclotetradec-8-en-3-yl]butyl]carbamate —— C29H43N3O7
    benzyl N-[4-[(3S,6R)-6-[2-[[(2R)-1-hydroxypropan-2-yl]amino]-2-oxoethyl]-5,14-dioxo-1-oxa-4-azacyclotetradec-8-en-3-yl]butyl]carbamate
    —— (3S,6R,13R)-13-benzyl-3-tert-butyl-6-[2-[(2S)-2-(hydroxymethyl)pyrrolidin-1-yl]-2-oxoethyl]-1-oxa-4-azacyclotetradec-8-ene-5,14-dione —— C30H44N2O5
    (3S,6R,13R)-13-benzyl-3-tert-butyl-6-[2-[(2S)-2-(hydroxymethyl)pyrrolidin-1-yl]-2-oxoethyl]-1-oxa-4-azacyclotetradec-8-ene-5,14-dione
    —— 2-[(3R,6R)-3-benzyl-5,13-dioxo-1-oxa-4-azacyclotridec-8-en-6-yl]-N-[(2R)-1-hydroxy-3-phenylpropan-2-yl]acetamide —— C29H36N2O5
    2-[(3R,6R)-3-benzyl-5,13-dioxo-1-oxa-4-azacyclotridec-8-en-6-yl]-N-[(2R)-1-hydroxy-3-phenylpropan-2-yl]acetamide
    —— (2S,3S)-2-amino-3-(4-ethoxyphenyl)-4-[(2-methylpropan-2-yl)oxy]-4-oxobutanoic acid —— C16H23NO5
    (2S,3S)-2-amino-3-(4-ethoxyphenyl)-4-[(2-methylpropan-2-yl)oxy]-4-oxobutanoic acid
    —— (2R,3R,4S,5R)-2-[[(2R,3R)-2-(3,4-dihydroxyphenyl)-3,5-dihydroxy-3,4-dihydro-2H-chromen-7-yl]oxy]oxane-3,4,5-triol —— C20H22O10
    (2R,3R,4S,5R)-2-[[(2R,3R)-2-(3,4-dihydroxyphenyl)-3,5-dihydroxy-3,4-dihydro-2H-chromen-7-yl]oxy]oxane-3,4,5-triol
    —— (2S,3R)-2-amino-3-(4-ethoxyphenyl)-4-[(2-methylpropan-2-yl)oxy]-4-oxobutanoic acid —— C16H23NO5
    (2S,3R)-2-amino-3-(4-ethoxyphenyl)-4-[(2-methylpropan-2-yl)oxy]-4-oxobutanoic acid