4-penten-2-ynoic acid, 5-(2-methylphenyl)-, methyl ester, (4E)- InChI=1/C13H12O2/c1-11-7-3-4-8-12(11)9-5-6-10-13(14)15-2/h3-5,7-9H,1-2H3/b9-5 methyl (4E)-5-(2-methylphenyl)pent-4-en-2-ynoate