1,4-Diphenyl-1,3-butadiyne 1,4-Diphenylbutadiyne 886-66-8 Benzene, 1,1'-(1,3-butadiyne-1,4-diyl)bis- Butadiyne, diphenyl- Diphenyl-1,3-butadiyne Diphenylbutadiyne Diphenyldiacetylene NSC529170