1,4-Bis(diethylamino)-2-butyne 105-18-0 2-Butyne-1,4-diamine, N,N,N',N'-tetraethyl- 2-Butynylenediamine, N,N,N'N'-tetraethyl- N,N,N',N'-Tetraethyl-2-butynylenediamine NSC166328 WLN: 2N2&2UU2N2&2