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