Propiolic acid471-25-032 % similar Dimethyl maleate624-48-632 % similar Dimethyl fumarate624-49-732 % similar Propynamide7341-96-032 % similar Methyl chloroformate79-22-132 % similar Dimethyl glutarate1119-40-031 % similar Methyl cyanoacetate105-34-030 % similar Methyl tiglate6622-76-030 % similar