3,4-dimethylphenyl 9-oxo-9H-fluorene-3-carboxylate
3,4-dimethylphenyl 9-oxo-9H-fluorene-3-carboxylate ??
??
3,4-dimethylphenyl 9-oxo-9H-fluorene-3-carboxylate C??? ??, ??, ??
3,4-dimethylphenyl 9-oxo-9H-fluorene-3-carboxylate ?? ?? ? ???
???
?? ??
3,4-dimethylphenyl 9-oxo-9H-fluorene-3-carboxylate ?? ??
???( 1)?? ??