1,2-Diphenylacetylene 501-65-5 72234-42-5 AI3-04360 Acetylene, diphenyl- (8CI) Benzene, 1,1'-(1,2-ethynediyl)bis- Biphenylacetylene DIPHENYLACETYLENE Diphenylethyne EINECS 207-926-6 Ethyne, diphenyl- NSC 5185 Tolan Tolane