1	FCO	Carbonmonoxide-(dicyano) iron	1.000
2	EJ2	Ni-Fe reduced active center	0.875
3	NFU	Formyl[bis(hydrocyanato-1kappac)]ironnickel(Fe-ni)	0.875
4	NWN	Hydrido[hydridonickel(2+)]bis(hydrocyanato-1kappac)(hydroxymethyl)iron	0.875
5	NFV	Ni-Fe oxidized active center	0.778
6	J52	Dicyano-(oxidaniumylidynemethylnickelio)-(oxidanylidenemethylidene)iron	0.700