1	NFV	Ni-Fe oxidized active center	1.000
2	NFO	Ni-Fe oxidized active center	0.800
3	FCO	Carbonmonoxide-(dicyano) iron	0.778
4	NFC	Ni-Fe active center a-form	0.727
5	EJ2	Ni-Fe reduced active center	0.700
6	NFU	Formyl[bis(hydrocyanato-1kappac)]ironnickel(Fe-ni)	0.700
7	NWN	Hydrido[hydridonickel(2+)]bis(hydrocyanato-1kappac)(hydroxymethyl)iron	0.700