(Ethylenediamine-N,N')(propane-1,2-diamine-N,N')copper bis(di(cyano-C)aurate) 67906-20-1 Copper isopropylenediamine ethylenediamine gold cyanide Copper(2+), (1,2-ethanediamine-kappaN,kappaN')(1,2-propanediamine-kappaN,kappaN')-, bis(bis(cyano-kappaC)aurate(1-)) EINECS 267-693-1