RESIDUE   D6O     15
CONECT      OB     1 CG  
CONECT      CG     3 OB   CD2  OB2 
CONECT      NE1    3 CZ   CG1  H1  
CONECT      CZ     3 NE1  OH   CE2 
CONECT      OH     1 CZ  
CONECT      CE2    3 CZ   CD2  H2  
CONECT      CD2    3 CG   CE2  H3  
CONECT      CG1    3 NE1  OB1  H4  
CONECT      OB1    1 CG1 
CONECT      OB2    2 CG   H5  
CONECT      H1     1 NE1 
CONECT      H2     1 CE2 
CONECT      H3     1 CD2 
CONECT      H4     1 CG1 
CONECT      H5     1 OB2 
END   
HET    D6O             15
HETNAM     D6O (~{Z})-4-formamido-4-oxidanylidene-but-2-enoic acid
FORMUL      D6O    C5 H5 N1 O4