RESIDUE   FSF      7
CONECT      FE5    4 FE6  O10  S5   S6  
CONECT      FE6    3 FE5  S5   S6  
CONECT      FE7    2 FE8  O10 
CONECT      FE8    2 FE7  S6  
CONECT      O10    2 FE5  FE7 
CONECT      S5     2 FE5  FE6 
CONECT      S6     3 FE5  FE6  FE8 
END   
HET    FSF              7
HETNAM     FSF 4FE-2S-O HYBRID CLUSTER
FORMUL      FSF    Fe4 O1 S2