4-(4-carbomethoxy-phenylethinyl)-benzoic acid methyl ester InChI=1/C18H14O4/c1-21-17(19)15-9-5-13(6-10-15)3-4-14-7-11-16(12-8-14)18(20)22-2/h5-12H,1-2H benzoic acid, 4,4'-(1,2-ethynediyl)bis-, dimethyl ester dimethyl 4,4'-ethyne-1,2-diyldibenzoate