2-Propynoic acid, methyl ester (9CI) 4-02-00-01688 (Beilstein Handbook Reference) 922-67-8 AI3-37828 Acetylenecarboxylic acid methyl ester BRN 0605462 EINECS 213-083-5 METHYL PROPIOLATE Methyl acetylenecarboxylate Methyl ethynecarboxylate Methyl propynoate NSC 154164 Propiolic acid, methyl ester Propynoic acid, methyl ester