RESIDUE   HZN      6
CONECT      N2     3 N1   H1   H2  
CONECT      N1     3 N2   H3   H4  
CONECT      H1     1 N2  
CONECT      H2     1 N2  
CONECT      H3     1 N1  
CONECT      H4     1 N1  
END   
HET    HZN              6
HETNAM     HZN hydrazine
FORMUL      HZN    H4 N2