1-Methyl-4-oxo-2,5-cyclohexadiene-1,3-dicarboxylic acid dimethyl ester
1-Methyl-4-oxo-2,5-cyclohexadiene-1,3-dicarboxylic acid dimethyl ester ??
??
1-Methyl-4-oxo-2,5-cyclohexadiene-1,3-dicarboxylic acid dimethyl ester C??? ??, ??, ??
1-Methyl-4-oxo-2,5-cyclohexadiene-1,3-dicarboxylic acid dimethyl ester ?? ?? ? ???
???
?? ??
1-Methyl-4-oxo-2,5-cyclohexadiene-1,3-dicarboxylic acid dimethyl ester ?? ??
???( 0)?? ??