73840-15-0 NSC94515 Piperazine, 1,4-bis[3-(3-butylureido)propyl]- Urea, 1,1'-[1,4-piperazinediylbis(trimethylene)]bis[3-butyl- Urea, N,N''-(1,4-piperazinediyldi-3,1-propanediyl)bis[N'-butyl-