Propiolic acid471-25-0100 % similar Acetylenedicarboxylic acid142-45-050 % similar Tetrolic acid590-93-239 % similar 3-Butyn-2-one1423-60-536 % similar Propynamide7341-96-036 % similar 3-(Trimethylsilyl)propiolic acid5683-31-835 % similar 2-Hexynoic acid764-33-032 % similar Monopotassium acetylenedicarboxylate928-04-132 % similar Methyl propiolate922-67-832 % similar Phenylpropiolic acid637-44-531 % similar