RESIDUE   PCA     16
CONECT      N      3 CA   CD   H   
CONECT      CA     4 N    CB   C    HA  
CONECT      CB     4 CA   CG   HB2  HB3 
CONECT      CG     4 CB   CD   HG2  HG3 
CONECT      CD     3 N    CG   OE  
CONECT      OE     1 CD  
CONECT      C      3 CA   O    OXT 
CONECT      O      1 C   
CONECT      OXT    2 C    HXT 
CONECT      H      1 N   
CONECT      HA     1 CA  
CONECT      HB2    1 CB  
CONECT      HB3    1 CB  
CONECT      HG2    1 CG  
CONECT      HG3    1 CG  
CONECT      HXT    1 OXT 
END   
HET    PCA             16
HETNAM     PCA PYROGLUTAMIC ACID
FORMUL      PCA    C5 H7 N1 O3