RESIDUE   B2N     20
CONECT      OE1    1 CD  
CONECT      CD     3 OE1  NE2  CG  
CONECT      NE2    3 CD   H1   H10 
CONECT      CG     4 CD   CA   H3   H4  
CONECT      CB     4 N    CA   H5   H6  
CONECT      N      3 CB   H    H2  
CONECT      CA     4 CG   CB   C    HA  
CONECT      C      3 CA   O    OXT 
CONECT      O      1 C   
CONECT      H1     1 NE2 
CONECT      H10    1 NE2 
CONECT      H3     1 CG  
CONECT      H4     1 CG  
CONECT      H5     1 CB  
CONECT      H6     1 CB  
CONECT      H      1 N   
CONECT      H2     1 N   
CONECT      HA     1 CA  
CONECT      OXT    2 C    HXT 
CONECT      HXT    1 OXT 
END   
HET    B2N             20
HETNAM     B2N (2S)-4-amino-2-(aminomethyl)-4-oxobutanoic acid
FORMUL      B2N    C5 H10 N2 O3