1-Methoxybutane-1,3-dione 105-45-3 3-Oxobutanoic acid methyl ester AI3-06000 Acetoacetic acid methyl ester Acetoacetic acid, methyl ester Acetoacetic methyl ester Butanoic acid, 3-oxo-, methyl ester CCRIS 2302 EINECS 203-299-8 HSDB 1083 METHYL ACETOACETATE Methyl 3-oxobutanoate Methyl 3-oxobutyrate Methyl acetylacetate Methyl acetylacetonate Methylacetoacetate Methylester kyseliny acetoctove [Czech]