RESIDUE   FSX     10
CONECT      FE1    4 FE3  S2   S3   O12 
CONECT      FE2    3 O1   O24  O12 
CONECT      FE4    4 FE3  S3   S4   O24 
CONECT      O1     1 FE2 
CONECT      S2     2 FE1  FE3 
CONECT      S3     3 FE1  FE3  FE4 
CONECT      S4     2 FE3  FE4 
CONECT      O24    2 FE2  FE4 
CONECT      O12    2 FE1  FE2 
END   
HET    FSX             10
HETSYN     FSX FE4-S3-O3 CLUSTER
HETNAM     FSX BIS-(MU-2-OXO),[(MU-3--SULFIDO)-BIS(MU-2--SULFIDO)-TRIS
HETNAM   2 FSX (CYS-S)-TRI-IRON] (AQUA)(GLU-O)IRON(II)
FORMUL      FSX    Fe4 O3 S3