RESIDUE   XSP     16
CONECT      C1     3 C2   O1   O2  
CONECT      C2     4 C1   C3   O1P  H1  
CONECT      C3     3 C2   O3   H2  
CONECT      P      4 O1P  O2P  O3P  O4P 
CONECT      O1     1 C1  
CONECT      O2     2 C1   H4  
CONECT      O3     1 C3  
CONECT      O1P    2 C2   P   
CONECT      O2P    1 P   
CONECT      O3P    2 P    H6  
CONECT      O4P    2 P    H7  
CONECT      H1     1 C2  
CONECT      H2     1 C3  
CONECT      H4     1 O2  
CONECT      H6     1 O3P 
CONECT      H7     1 O4P 
END   
HET    XSP             16
HETSYN     XSP D-tartronate semialdehyde 2-phosphate
HETNAM     XSP (2R)-3-oxo-2-(phosphonooxy)propanoic acid
FORMUL      XSP    C3 H5 O7 P1