3,4-dihydroxybenzaldehyde {2-nitrophenyl}hydrazone
3,4-dihydroxybenzaldehyde {2-nitrophenyl}hydrazone ??
??
3,4-dihydroxybenzaldehyde {2-nitrophenyl}hydrazone C??? ??, ??, ??
3,4-dihydroxybenzaldehyde {2-nitrophenyl}hydrazone ?? ?? ? ???
???
?? ??
3,4-dihydroxybenzaldehyde {2-nitrophenyl}hydrazone ?? ??
???( 1)?? ??