Carbamic acid, N,N'-(1,4-piperazinediyldi-2,1-ethanediyl)bis-, C,C'-bis(1,1-dimethylethyl) ester 5g

Carbamic acid, N,N'-(1,4-piperazinediyldi-2,1-ethanediyl)bis-, C,C'-bis(1,1-dimethylethyl) ester 5g