Structure based on 1pwd

Ideal structure
Name: 4-(3-acetoxymethyl-2-carboxy-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-en-7-ylcarbamoyl)-1-carboxy-butyl-ammonium
Formula: C16 H22 N3 O8 S
Weight: 416.426
SMILES: "CC(=O)OCC1=C(N2[CH](SC1)[CH](NC(=O)CCC[CH]([NH3+])C(O)=O)C2=O)C(O)=O"
Spacial conformation based on PDB 1pwd.
Also present on 2vav, 2vax, 4koy
RESIDUE   CSC     50
CONECT      S1     2 C2   C6  
CONECT      C2     4 S1   C3   H11  H12 
CONECT      C3     3 C2   C3'  C4  
CONECT      C3'    4 C3   O1   H3'1 H3'2
CONECT      C4     3 C3   C4'  N5  
CONECT      C4'    3 C4   O4A  O4B 
CONECT      O4A    2 C4'  H4A 
CONECT      O4B    1 C4' 
CONECT      N5     3 C4   C6   C8  
CONECT      C6     4 S1   N5   C7   H6  
CONECT      C7     4 C6   C8   N10  H7  
CONECT      C8     3 N5   C7   O9  
CONECT      O9     1 C8  
CONECT      N10    3 C7   C11  H10 
CONECT      C11    3 N10  O12  C13 
CONECT      O12    1 C11 
CONECT      C13    4 C11  C14  H131 H132
CONECT      C14    4 C13  C15  H141 H142
CONECT      C15    4 C14  C16  H151 H152
CONECT      C16    4 C15  N17  C18  H16 
CONECT      N17    4 C16  H171 H172 H173
CONECT      C18    3 C16  O19  O20 
CONECT      O19    1 C18 
CONECT      O20    2 C18  H20 
CONECT      O1     2 C3'  C1  
CONECT      C1     3 O1   O2   C20 
CONECT      O2     1 C1  
CONECT      C20    4 C1   H201 H202 H203
CONECT      H11    1 C2  
CONECT      H12    1 C2  
CONECT      H3'1   1 C3' 
CONECT      H3'2   1 C3' 
CONECT      H4A    1 O4A 
CONECT      H6     1 C6  
CONECT      H7     1 C7  
CONECT      H10    1 N10 
CONECT      H131   1 C13 
CONECT      H132   1 C13 
CONECT      H141   1 C14 
CONECT      H142   1 C14 
CONECT      H151   1 C15 
CONECT      H152   1 C15 
CONECT      H16    1 C16 
CONECT      H171   1 N17 
CONECT      H172   1 N17 
CONECT      H173   1 N17 
CONECT      H20    1 O20 
CONECT      H201   1 C20 
CONECT      H202   1 C20 
CONECT      H203   1 C20 
END   
HET    CSC             50
HETSYN     CSC CEPHALOSPORIN C
HETNAM     CSC 4-(3-ACETOXYMETHYL-2-CARBOXY-8-OXO-5-THIA-1-AZA-BICYCLO
HETNAM   2 CSC [4.2.0]OCT-2-EN-7-YLCARBAMOYL)-1-CARBOXY-BUTYL-AMMONIUM
FORMUL      CSC    C16 H22 N3 O8 S1 1+

This OCA MONOMER page
uses Jmol, developed by the Jmol Development Team (color reference)
OCA© by Jaime Prilusky, 1996-2004,2006,2010,2014
Bioinformatics Unit
Weizmann Institute of Science