RESIDUE   PNH     16
CONECT      C1     4 C2   H1   H1A  H1B 
CONECT      C3     4 C4   C2   H3   H3A 
CONECT      C4     3 C3   O6   C5  
CONECT      O6     1 C4  
CONECT      C5     4 C4   H5   H5A  H5B 
CONECT      C2     4 C1   C3   H2   H2A 
CONECT      H1     1 C1  
CONECT      H1A    1 C1  
CONECT      H1B    1 C1  
CONECT      H3     1 C3  
CONECT      H3A    1 C3  
CONECT      H5     1 C5  
CONECT      H5A    1 C5  
CONECT      H5B    1 C5  
CONECT      H2     1 C2  
CONECT      H2A    1 C2  
END   
HET    PNH             16
HETNAM     PNH pentan-2-one
FORMUL      PNH    C5 H10 O