(2,2',2'',2'''-(Ethylenedinitrilo)tetra(propan-2-ol)-N,N',O,O',O'',O''')copper(2+) sulphate 68975-66-6 Copper(2+), (2,2',2'',2'''-(1,2-ethanediyldi(nitrilo-kappaN))tetrakis(2-propanol-kappaO))-, (OC-6-21)-, sulfate (1:1) EINECS 273-474-1