1-(2-Hydroxyphenyl)-3,4-dihydro-4-oxo-5,7-dimethylphthalazine-6-carboxylic acid ethyl ester C??? ??, ??, ??

1-(2-Hydroxyphenyl)-3,4-dihydro-4-oxo-5,7-dimethylphthalazine-6-carboxylic acid ethyl ester ?? ?? ? ???

???

?? ??

1-(2-Hydroxyphenyl)-3,4-dihydro-4-oxo-5,7-dimethylphthalazine-6-carboxylic acid ethyl ester ?? ??