90149-40-9 Copper(2+), (N,N'-bis(2-pyridinylmethylene)-1,4-butanediamine-N,N',N'',N''')-, (SP-4-2)-, diperchlorate Copper-putrescine-pyridine Cu-Pupy Cupu(Py)2 N,N'-Bis(2-pyridylmethylene)-1,4-butanediamine (N,N',N'',N''')-Cu(II)diperchlorate