nocardicin a nocardicin a nocardicin a is a monocyclic β-lactam antibiotic included in the monobactam subclass. it is obtained from the fermentation broth of a strain of actinomycetes nocardia uniformis subsp. tsuyamenensis as a metabolic product catalyzed by the enzyme nocardicin-a epimerase. it is stereochemically and biologically related to penicillin and cephalosporins. biosynthesis of nocardicin a nocardicin a names iupac name (2r)-2-amino-4--2-oxoazetidin-3- yl]carbamoyl]carbonimidoyl]phenoxy]butanoic acid identifiers cas number 39391-39-4 y 3d model (jsmol) interactive image chemspider 4925179 y pubchem cid 6419429 unii r76hlw7z19 y inchi inchi=1s/c23h24n4o9/c24-16(22(31)32)9-10-36-15-7-3-12(4-8-15)18(26-35)20(29)25-17-11-27(21(17)30)19(23(33)34)13-1-5-14(28)6-2-13/h1-8,16-17,19,28,35h,9-11,24h2,(h,25,29)(h,31,32)(h,33,34)/b26-18+/t16-,17+,19-/m1/s1 ykey: ctnzogjnvifeba-twtpmlpmsa-n yinchi=1/c23h24n4o9/c24-16(22(31)32)9-10-36-15-7-3-12(4-8-15)18(26-35)20(29)25-17-11-27(21(17)30)19(23(33)34)13-1-5-14(28)6-2-13/h1-8,16-17,19,28,35h,9-11,24h2,(h,25,29)(h,31,32)(h,33,34)/b26-18+/t16-,17+,19-/m1/s1key: ctnzogjnvifeba-twtpmlpmbj smiles o=c(o)(c1ccc(o)cc1)n3c(=o)(nc(=o)\c(=n\o)c2ccc(occ(c(=o)o)n)cc2)c3 properties chemical formula c23h24n4o9 molar mass 500.46 g/mol except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). y verify (what is yn ?) infobox references