2-butenedioic acid, 2-(phenylethynyl)-, dimethyl ester, (2Z)- InChI=1/C14H12O4/c1-17-13(15)10-12(14(16)18-2)9-8-11-6-4-3-5-7-11/h3-7,10H,1-2H3/b12-10 dimethyl (2Z)-2-(phenylethynyl)but-2-enedioate