M 2685 (OTTO) Methyl propiolate, 99% Cas 922-67-8 - used in the synthesis of polysubstituted 3-arylaminoacrylate and tetrahydropyrimidin-2-one derivatives. M 2685 (OTTO) Methyl propiolate, 99% Cas 922-67-8 - used as a thiol derivatizing agent for capillary electrophoresis.