67859-43-2 Bis(ethane-1,2-diamine-N,N')copper(2+) tetrakis(cyano-C)zincate(2-) Copper ethylenediamine zinc cyanide Copper(2+), bis(1,2-ethanediamine-kappaN,kappaN')-, (T-4)-tetrakis(cyano-kappaC)zincate(2-) (1:1) EINECS 267-393-0