1	CFM	Fe-mo-S cluster	1.000
2	CFN	Fe(7)-mo-S(9)-N cluster	0.944
3	ICS	Iron-sulfur-molybdenum cluster with interstitial carbon	0.944
4	ICE	Iron-sulfur-molybdenum cluster with interstitial carbon	0.889
5	ICG	Iron-sulfur-molybdenum cluster with interstitial carbon with selenium incorporated	0.842
6	S5Q	Fefe cofactor	0.842
7	ICZ	Iron-sulfur-molybdenum cluster with interstitial carbon	0.833
8	8P8	C fe7 s8 V	0.789
9	BJ8	Double cubane cluster	0.700
10	D6N	Fev	0.700