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内酰胺类

中文名称 英文名称 CAS号 化学式 结构式图片
—— 4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid, 6-[(aminophenylacetyl)amino]-3,3-dimethyl-7-oxo-, diphenylmethyl ester, [2S-[2I+/-,5I+/-,6I(2)(S*)]]- 55775-93-4 C29H29N3O4S
4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid, 6-[(aminophenylacetyl)amino]-3,3-dimethyl-7-oxo-, diphenylmethyl ester, [2S-[2I+/-,5I+/-,6I(2)(S*)]]-
—— (2S,5R,6R)-3,3-Dimethyl-7-oxo-6-[[1-oxo-3-(3,4,5-trimethylphenoxy)butyl]amino]-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 903505-28-2 C21H28N2O5S
(2S,5R,6R)-3,3-Dimethyl-7-oxo-6-[[1-oxo-3-(3,4,5-trimethylphenoxy)butyl]amino]-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid
—— 3-Bromomethyl-1-phenyl-azetidin-2-one 69193-76-6 C10H10BrNO
3-Bromomethyl-1-phenyl-azetidin-2-one
—— 5-Thia-1-azabicyclo[4.2.0]oct-3-ene-2-carboxylic acid, 3-[3-[(5-methyl-1,3,4-thiadiazol-2-yl)thio]-1-propenyl]-8-oxo-7-[(2-thienylacetyl)amino]-, diphenylmethyl ester, [2R-[2I+/-,3(E),6I+/-,7I(2)]]- 69958-69-6 C32H28N4O4S4
5-Thia-1-azabicyclo[4.2.0]oct-3-ene-2-carboxylic acid, 3-[3-[(5-methyl-1,3,4-thiadiazol-2-yl)thio]-1-propenyl]-8-oxo-7-[(2-thienylacetyl)amino]-, diphenylmethyl ester, [2R-[2I+/-,3(E),6I+/-,7I(2)]]-
—— (2S,5R,6R)-6-[(2-Mercaptoacetyl)amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 907578-72-7 C10H14N2O4S2
(2S,5R,6R)-6-[(2-Mercaptoacetyl)amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid
—— (2S,5R,6R)-6-[[3-(2,5-Dichlorophenoxy)-1-oxobutyl]amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 906332-45-4 C18H20Cl2N2O5S
(2S,5R,6R)-6-[[3-(2,5-Dichlorophenoxy)-1-oxobutyl]amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid
—— hexahydro-7-[(3-phenylisoxazol-4-yl)methyl]-2H-azepin-2-one 253139-43-4 C16H18N2O2
hexahydro-7-[(3-phenylisoxazol-4-yl)methyl]-2H-azepin-2-one
—— (2S,5R,6R)-6-[[3-(Cyclohexyloxy)-1-oxobutyl]amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 903505-40-8 C18H28N2O5S
(2S,5R,6R)-6-[[3-(Cyclohexyloxy)-1-oxobutyl]amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid
—— tert-butyl (2R,3R)-1-(4-(tert-butyl)phenyl)-3-(3-(2-(5-methyl-2-phenyloxazol-4-yl)ethoxy)benzyl)-4-oxoazetidine-2-carboxylate 1025127-65-4 C37H42N2O5
tert-butyl (2R,3R)-1-(4-(tert-butyl)phenyl)-3-(3-(2-(5-methyl-2-phenyloxazol-4-yl)ethoxy)benzyl)-4-oxoazetidine-2-carboxylate
—— (6<i>R</i>)-3-acetoxymethyl-7<i>t</i>-[2-(2-amino-thiazol-4-yl)-2-(<i>E</i>)-isopropoxyimino-acetylamino]-8-oxo-(6<i>r</i><i>H</i>)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid 63504-22-3 C18H21N5O7S2
(6<i>R</i>)-3-acetoxymethyl-7<i>t</i>-[2-(2-amino-thiazol-4-yl)-2-(<i>E</i>)-isopropoxyimino-acetylamino]-8-oxo-(6<i>r</i><i>H</i>)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid
—— (6R)-3-methyl-8-oxo-7t-(2-tetrazol-1-yl-acetylamino)-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid 2,2-dimethyl-propionyloxymethyl ester 72781-74-9 C17H22N6O6S
(6R)-3-methyl-8-oxo-7t-(2-tetrazol-1-yl-acetylamino)-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid 2,2-dimethyl-propionyloxymethyl ester
—— 5-Thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid, 7-[[[4-(2-amino-1-carboxy-2-oxoethylidene)-1,3-dithietan-2-yl]carbonyl]amino]-7-methoxy-3-[[(5-methyl-1,3,4-thiadiazol-2-yl)thio]methyl]-8-oxo-, [6R-(6I+/-,7I+/-)]- 69712-57-8 C18H17N5O8S5
5-Thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid, 7-[[[4-(2-amino-1-carboxy-2-oxoethylidene)-1,3-dithietan-2-yl]carbonyl]amino]-7-methoxy-3-[[(5-methyl-1,3,4-thiadiazol-2-yl)thio]methyl]-8-oxo-, [6R-(6I+/-,7I+/-)]-
—— sodium (4R,5S,6S)-6-[(1R)-1-hydroxyethyl]-3-[2-(imidazo[1,2-a]pyridin-5-yl)ethylthio]-4-methyl-7-oxo-1-azabicyclo [3.2.0]hept-2-ene-2-carboxylate 193682-66-5 C19H20N3O4S*Na
sodium (4R,5S,6S)-6-[(1R)-1-hydroxyethyl]-3-[2-(imidazo[1,2-a]pyridin-5-yl)ethylthio]-4-methyl-7-oxo-1-azabicyclo [3.2.0]hept-2-ene-2-carboxylate
—— sodium (4R,5S,6S)-6-[(1R)-1-hydroxyethyl]-3-[2-(imidazo[2,1-b][1,3,4]thiadiazol-6-yl)ethylthio]-4-methyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate 193682-64-3 C16H17N4O4S2*Na
sodium (4R,5S,6S)-6-[(1R)-1-hydroxyethyl]-3-[2-(imidazo[2,1-b][1,3,4]thiadiazol-6-yl)ethylthio]-4-methyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate
—— 2-[4-Oxo-3-(2-phenoxy-acetylamino)-azetidin-2-ylsulfanyl]-malonic acid methyl ester 4-nitro-benzyl ester 95477-74-0 C22H21N3O9S
2-[4-Oxo-3-(2-phenoxy-acetylamino)-azetidin-2-ylsulfanyl]-malonic acid methyl ester 4-nitro-benzyl ester
—— 1415631-84-3 C16H17N3O3
—— (3-Amino-phenyl)-(2-oxo-3-phenylacetylamino-azetidin-1-yl)-acetic acid methyl ester 59509-30-7 C20H21N3O4
(3-Amino-phenyl)-(2-oxo-3-phenylacetylamino-azetidin-1-yl)-acetic acid methyl ester
—— 4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid, 6-[[(2R)-amino(3-hydroxyphenyl)acetyl]amino]-3,3-dimethyl-7-oxo-, (2S,5R,6R)- 26787-81-5 C16H19N3O5S
4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid, 6-[[(2R)-amino(3-hydroxyphenyl)acetyl]amino]-3,3-dimethyl-7-oxo-, (2S,5R,6R)-
—— {3-(4-{(2S,3R)-3-[(3S)-3-(4-fluorophenyl)-3-hydroxypropyl]-4-oxo-1-(4-[6-(1H-1,2,4-triazol-1-yl)hexyl]phenyl)azetidin-2-yl}phenyl)propyl}(hydroxyl)malonic acid 1227267-82-4 C38H43FN4O7
{3-(4-{(2S,3R)-3-[(3S)-3-(4-fluorophenyl)-3-hydroxypropyl]-4-oxo-1-(4-[6-(1H-1,2,4-triazol-1-yl)hexyl]phenyl)azetidin-2-yl}phenyl)propyl}(hydroxyl)malonic acid
—— N-[4-[2-[3-chloro-2-(4-hydroxy-3-methoxyphenyl)-4-oxoazetidin-1-yl]-1,3-thiazol-4-yl]phenyl]acetamide 1021684-81-0 C21H18ClN3O4S
N-[4-[2-[3-chloro-2-(4-hydroxy-3-methoxyphenyl)-4-oxoazetidin-1-yl]-1,3-thiazol-4-yl]phenyl]acetamide
—— 3-chloro-4-(2-chloro-phenyl)-1-[4-(4-nitro-benzenesulfonyl)-phenyl]-azetidin-2-one 67687-79-0 C21H14Cl2N2O5S
3-chloro-4-(2-chloro-phenyl)-1-[4-(4-nitro-benzenesulfonyl)-phenyl]-azetidin-2-one
—— 9(<i>or</i> 10)-bromo-6β-(2-phenoxy-acetylamino)-penicillanic acid 2,2,2-trichloro-ethyl ester 75645-47-5 C18H18BrCl3N2O5S
9(<i>or</i> 10)-bromo-6β-(2-phenoxy-acetylamino)-penicillanic acid 2,2,2-trichloro-ethyl ester
—— 1331772-06-5 C12H13NO2
—— (6<i>R</i>)-7<i>t</i>-((<i>R</i>)-2-amino-2-phenyl-acetylamino)-3-(5,6-dimethyl-pyrazin-2-ylsulfanylmethyl)-8-oxo-(6<i>r</i><i>H</i>)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid 64943-23-3 C22H23N5O4S2
(6<i>R</i>)-7<i>t</i>-((<i>R</i>)-2-amino-2-phenyl-acetylamino)-3-(5,6-dimethyl-pyrazin-2-ylsulfanylmethyl)-8-oxo-(6<i>r</i><i>H</i>)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid
—— 1-{4-[(4-{1-(4-fluorophenyl)-3-[3-(4-fluorophenyl)-3-hydroxypropyl]-4-oxoazetidin-2-yl}benzylcarbamoyl)methyl]benzyl}-1,4,7-trimethyl[1,4,7]triazonan-1-ium trifluoroacetate 640331-63-1 C2F3O2*C43H52F2N5O3
1-{4-[(4-{1-(4-fluorophenyl)-3-[3-(4-fluorophenyl)-3-hydroxypropyl]-4-oxoazetidin-2-yl}benzylcarbamoyl)methyl]benzyl}-1,4,7-trimethyl[1,4,7]triazonan-1-ium trifluoroacetate
—— Sodium; (6R,7R)-3-ethoxycarbonylmethyl-8-oxo-7-phenylacetylamino-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylate 92096-30-5 C19H19N2O6S*Na
Sodium; (6R,7R)-3-ethoxycarbonylmethyl-8-oxo-7-phenylacetylamino-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylate
—— (6<i>R</i>)-3-benzyl-8-oxo-7<i>t</i>-(2-tetrazol-2-yl-acetylamino)-(6<i>r</i><i>H</i>)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid <i>tert</i>-butyl ester 62967-38-8 C21H24N6O4S
(6<i>R</i>)-3-benzyl-8-oxo-7<i>t</i>-(2-tetrazol-2-yl-acetylamino)-(6<i>r</i><i>H</i>)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid <i>tert</i>-butyl ester
—— (6R)-7t-acetylamino-7c-methoxy-3-methyl-8-oxo-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid methyl ester 57001-60-2 C12H16N2O5S
(6R)-7t-acetylamino-7c-methoxy-3-methyl-8-oxo-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid methyl ester
—— (6<i>R</i>)-7<i>t</i>-[2-(<i>Z</i>)-cyclohexyloxyimino-2-(2-formylamino-thiazol-4-yl)-acetylamino]-8-oxo-(6<i>r</i><i>H</i>)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid 4-nitro-benzyl ester 68403-23-6 C26H26N6O8S2
(6<i>R</i>)-7<i>t</i>-[2-(<i>Z</i>)-cyclohexyloxyimino-2-(2-formylamino-thiazol-4-yl)-acetylamino]-8-oxo-(6<i>r</i><i>H</i>)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid 4-nitro-benzyl ester
—— (6<i>R</i>)-7<i>t</i>-[2-(2-formylamino-thiazol-4-yl)-2-(<i>Z</i>)-prop-2-ynyloxyimino-acetylamino]-3,8-dioxo-(6<i>r</i><i>H</i>)-5-thia-1-aza-bicyclo[4.2.0]octane-2ξ-carboxylic acid 4-nitro-benzyl ester 68403-36-1 C23H18N6O9S2
(6<i>R</i>)-7<i>t</i>-[2-(2-formylamino-thiazol-4-yl)-2-(<i>Z</i>)-prop-2-ynyloxyimino-acetylamino]-3,8-dioxo-(6<i>r</i><i>H</i>)-5-thia-1-aza-bicyclo[4.2.0]octane-2ξ-carboxylic acid 4-nitro-benzyl ester
—— p-Nitrobenzyl-7-(thiophen-2-acetamido)-3-methyl-3-cephem-4-carboxylat 37795-06-5 C21H19N3O6S2
p-Nitrobenzyl-7-(thiophen-2-acetamido)-3-methyl-3-cephem-4-carboxylat
—— (3S,4S)-3-<(R)-1-<(tert-butyldimethylsilyl)oxy>ethyl>-1-<(S)-1-phenylethyl>-4-<(phenylthio)methyl>-2-azetidinone 173105-94-7 C26H37NO2SSi
(3S,4S)-3-<(R)-1-<(tert-butyldimethylsilyl)oxy>ethyl>-1-<(S)-1-phenylethyl>-4-<(phenylthio)methyl>-2-azetidinone
—— ((2R,3S)-3-Amino-2-methylsulfanyl-4-oxo-azetidin-1-yl)-phenyl-acetic acid benzyl ester 63854-85-3 C19H20N2O3S
((2R,3S)-3-Amino-2-methylsulfanyl-4-oxo-azetidin-1-yl)-phenyl-acetic acid benzyl ester
—— 6-(2-Cyclohexyloxy-acetylamino)-3,3-dimethyl-7-oxo-4-thia-1-aza-bicyclo[3.2.0]heptane-2-carboxylic acid 94429-51-3 C16H24N2O5S
6-(2-Cyclohexyloxy-acetylamino)-3,3-dimethyl-7-oxo-4-thia-1-aza-bicyclo[3.2.0]heptane-2-carboxylic acid
—— <i>N</i>-((5<i>R</i>)-2<i>c</i>-isocyanato-3,3-dimethyl-4,4,7-trioxo-(5<i>r</i><i>H</i>)-4λ<sup>6</sup>-thia-1-aza-bicyclo[3.2.0]hept-6<i>t</i>-yl)-2-methyl-2-(2-nitro-phenoxy)-propionamide 37696-08-5 C18H20N4O8S
<i>N</i>-((5<i>R</i>)-2<i>c</i>-isocyanato-3,3-dimethyl-4,4,7-trioxo-(5<i>r</i><i>H</i>)-4λ<sup>6</sup>-thia-1-aza-bicyclo[3.2.0]hept-6<i>t</i>-yl)-2-methyl-2-(2-nitro-phenoxy)-propionamide
—— (6<i>R</i>)-8-oxo-2-sulfosulfanylmethyl-7<i>t</i>-(2-thiophen-2-yl-acetylamino)-(6<i>r</i><i>H</i>)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-1-carboxylic acid; monosodium salt 40704-27-6 C14H13N2O7S4*Na
(6<i>R</i>)-8-oxo-2-sulfosulfanylmethyl-7<i>t</i>-(2-thiophen-2-yl-acetylamino)-(6<i>r</i><i>H</i>)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-1-carboxylic acid; monosodium salt
—— N-[(2R,3R)-1-[(R)-1-(Benzhydrylidene-hydrazinocarbonyl)-2-methyl-allyl]-2-((E)-2-butoxy-propenylsulfanyl)-4-oxo-azetidin-3-yl]-2-phenyl-acetamide 65112-13-2 C36H40N4O4S
N-[(2R,3R)-1-[(R)-1-(Benzhydrylidene-hydrazinocarbonyl)-2-methyl-allyl]-2-((E)-2-butoxy-propenylsulfanyl)-4-oxo-azetidin-3-yl]-2-phenyl-acetamide
—— 7-(α-Sulfo-n-caproamido)cephalosporansaeure 710936-30-4 C16H22N2O9S2
7-(α-Sulfo-n-caproamido)cephalosporansaeure
—— dibenzyl 2-[(2R)-4-methyl-1-[(5S)-3-methyl-5-[(2-methylpropan-2-yl)oxycarbonyl]-2-oxoimidazolidin-1-yl]-1-oxopentan-2-yl]propanedioate 195828-90-1 C32H40N2O8
dibenzyl 2-[(2R)-4-methyl-1-[(5S)-3-methyl-5-[(2-methylpropan-2-yl)oxycarbonyl]-2-oxoimidazolidin-1-yl]-1-oxopentan-2-yl]propanedioate
—— benzyl (1R,3S,6R,11aS)-6-((benzyloxy)methyl)-3-(3,3-bis(ethylthio)propyl)-10-bromo-1-(ethylthio)-7-methoxy-4-oxo-1,3,4,6,11,11a-hexahydro-2H-pyrazino[1,2-b]isoquinoline-2-carboxylate 1030029-63-0 C38H47BrN2O5S3
benzyl (1R,3S,6R,11aS)-6-((benzyloxy)methyl)-3-(3,3-bis(ethylthio)propyl)-10-bromo-1-(ethylthio)-7-methoxy-4-oxo-1,3,4,6,11,11a-hexahydro-2H-pyrazino[1,2-b]isoquinoline-2-carboxylate
—— 3-(5-Phenyl-pent-4-ynyl)-pyrrolidin-2-one 124943-48-2 C15H17NO
3-(5-Phenyl-pent-4-ynyl)-pyrrolidin-2-one
—— <i>N</i>-[2-(4-methoxy-phenyl)-4-oxo-1-(4-phenyl-thiazol-2-yl)-azetidin-3-yl]-2-phenyl-acetamide 67948-32-7 C27H23N3O3S
<i>N</i>-[2-(4-methoxy-phenyl)-4-oxo-1-(4-phenyl-thiazol-2-yl)-azetidin-3-yl]-2-phenyl-acetamide
—— (6R,7R)-8-Oxo-7-phenylacetylamino-3-((Z)-styryl)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid methyl ester 141726-84-3 C24H22N2O4S
(6R,7R)-8-Oxo-7-phenylacetylamino-3-((Z)-styryl)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid methyl ester
—— 4-nitrobenzyl (1S,5R,6S)-2-(6-carbamoylmethyl-7-ethylthioimidazo[5,1-b]thiazolium-2-yl)-6-((1R)-1-hydroxyethyl)-1-methyl-1-carbapen-2-em-3-carboxylate iodide 352306-60-6 C26H28N5O7S2*I
4-nitrobenzyl (1S,5R,6S)-2-(6-carbamoylmethyl-7-ethylthioimidazo[5,1-b]thiazolium-2-yl)-6-((1R)-1-hydroxyethyl)-1-methyl-1-carbapen-2-em-3-carboxylate iodide
—— (6R,7R)-8-Oxo-7-phenylacetylamino-3-((Z)-2-pyridin-4-yl-vinyl)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid methyl ester 140647-49-0 C23H21N3O4S
(6R,7R)-8-Oxo-7-phenylacetylamino-3-((Z)-2-pyridin-4-yl-vinyl)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid methyl ester
—— (3R*,4S*)-1-(p-anisyl)-3-benzyloxy-4-cyclohexylmethyl-2-azetidinone 129397-37-1 C24H29NO3
(3R*,4S*)-1-(p-anisyl)-3-benzyloxy-4-cyclohexylmethyl-2-azetidinone
—— [(2S,3R)-1-[6-[(2S,3R)-3-acetyloxy-2-[(4S)-2,2-dimethyl-1,3-dioxolan-4-yl]-4-oxoazetidin-1-yl]hexa-2,4-diynyl]-2-[(4S)-2,2-dimethyl-1,3-dioxolan-4-yl]-4-oxoazetidin-3-yl] acetate 1031797-08-6 C26H32N2O10
[(2S,3R)-1-[6-[(2S,3R)-3-acetyloxy-2-[(4S)-2,2-dimethyl-1,3-dioxolan-4-yl]-4-oxoazetidin-1-yl]hexa-2,4-diynyl]-2-[(4S)-2,2-dimethyl-1,3-dioxolan-4-yl]-4-oxoazetidin-3-yl] acetate
—— (3S,4S)-1-(tert-butyldimethylsilyl)-3-benzyloxycarbonylamino-4-(tert-butyldimethylsilyloxymethyl)azetidin-2-one 98833-27-3 C24H42N2O4Si2
(3S,4S)-1-(tert-butyldimethylsilyl)-3-benzyloxycarbonylamino-4-(tert-butyldimethylsilyloxymethyl)azetidin-2-one
—— (3R,4S)-3-methoxy-1-(4-methoxy-benzyl)-4-(2-nitro-vinyl)-azetidin-2-one 1046160-93-3 C14H16N2O5
(3R,4S)-3-methoxy-1-(4-methoxy-benzyl)-4-(2-nitro-vinyl)-azetidin-2-one
—— {3-[4-((2S,3R)-3-[(3S)-3-(4-fluorophenyl)-3-hydroxypropyl]-1-{4-[3-hydroxy-5-(methylsulfonyl)pentyl]phenyl}-4-oxoazetidin-2-yl)phenyl]propyl}malonic acid 1227267-77-7 C36H42FNO9S
{3-[4-((2S,3R)-3-[(3S)-3-(4-fluorophenyl)-3-hydroxypropyl]-1-{4-[3-hydroxy-5-(methylsulfonyl)pentyl]phenyl}-4-oxoazetidin-2-yl)phenyl]propyl}malonic acid