1,4-dibutyl-2,5-diethynylbenzene InChI=1/C18H22/c1-5-9-11-17-13-16(8-4)18(12-10-6-2)14-15(17)7-3/h3-4,13-14H,5-6,9-12H2,1-2H benzene, 1,4-dibutyl-2,5-diethynyl-