RESIDUE   S3F      8
CONECT      S2     3 FE2  FE3  FE1 
CONECT      FE2    3 S2   S3   S1  
CONECT      S3     2 FE2  FE3 
CONECT      FE3    2 S2   S3  
CONECT      S1     3 FE2  FE1  FE4 
CONECT      FE1    3 S2   S1   O1  
CONECT      O1     1 FE1 
CONECT      FE4    1 S1  
END   
HET    S3F              8
HETNAM     S3F oxidized [Fe4-S3] cluster
FORMUL      S3F    Fe4 O1 S3