1	NFU	Formyl[bis(hydrocyanato-1kappac)]ironnickel(Fe-ni)	1.000
2	FCO	Carbonmonoxide-(dicyano) iron	0.875
3	J52	Dicyano-(oxidaniumylidynemethylnickelio)-(oxidanylidenemethylidene)iron	0.800
4	EJ2	Ni-Fe reduced active center	0.778
5	NFR	Ni-Fe reduced active center	0.778
6	NWN	Hydrido[hydridonickel(2+)]bis(hydrocyanato-1kappac)(hydroxymethyl)iron	0.778
7	NFV	Ni-Fe oxidized active center	0.700