1	8JU	Fe4-s4-O cluster	1.000
2	CUV	Fe(4)-ni(1)-S(4) cluster, oxidized	0.800
3	6ML	Oxygen-damaged sf4	0.727
4	BF8	Fe(4)-ni(1)-S(5) cluster with oxygen	0.727
5	9S8	Non-cubane [4Fe-4S]-cluster	0.700
6	ER2	Fe4s4	0.700
7	MSK	Broken Fe4S4 cluster	0.700
8	T2N	3,5-dioxa-7-thia-1-thionia-2$L^{2},4$L^{2},6$L^{3},8$L^{2}-tetraferrabicyclo[4.2.0]octane	0.700