1,1'-(2-Butynylene)dipiperidine 1,4-Dipiperidino-2-butyne 7498-32-0 NSC407430 Piperidine, 1,1'-(2-butyne-1,4-diyl)bis- Piperidine, 1,1'-(2-butynylene)di- WLN: T6NTJ A2UU2- AT6NTJ