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	CZL	L-cluster (fe8s9)	0.889
5	ICE	Iron-sulfur-molybdenum cluster with interstitial carbon	0.889
6	ICG	Iron-sulfur-molybdenum cluster with interstitial carbon with selenium incorporated	0.842
7	S5Q	Fefe cofactor	0.842
8	ICZ	Iron-sulfur-molybdenum cluster with interstitial carbon	0.833
9	8P8	C fe7 s8 V	0.789
10	BJ8	Double cubane cluster	0.700
11	D6N	Fev	0.700