1,1'-Biphenyl, 4-ethynyl 29079-00-3 4-05-00-02280 (Beilstein Handbook Reference) 4-Biphenylacetylene 4-Biphenylylacetylene 4-Ethynyl-1,1'-biphenyl 4-Ethynylbiphenyl BIPHENYL, 4-ETHYNYL- BRN 1927901 LY 81979 p-Biphenylacetylene