4H-Pyran-4-one, 2-methyl-3-(ethoxycarbonyloxy)- 68140-50-1 Carbonic acid, ethyl 2-methyl-4-oxo-4H-pyran-3-yl ester EINECS 268-802-5 Ethyl 2-methyl-4-oxo-4H-pyran-3-yl carbonate