RESIDUE   A1CBX      7
CONECT      S1     2 FE1  FE2 
CONECT      S2     2 FE1  FE2 
CONECT      S3     2 FE1  FE3 
CONECT      S4     2 FE1  FE3 
CONECT      FE1    4 S1   S2   S3   S4  
CONECT      FE2    2 S1   S2  
CONECT      FE3    2 S3   S4  
END   
HET    A1CBX              7
HETNAM     A1CBX 1,3,5,7-tetrathia-2$l^{2},4$l^{4},6$l^{2}-triferraspiro
HETNAM   2 A1CBX [3.3]heptane
FORMUL      A1CBX    Fe3 S4