2,6-Bis(1H-imidazol-1-ylmethyl)-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylic acid 3-methyl 5-ethyl ester C??? ??, ??, ??

2,6-Bis(1H-imidazol-1-ylmethyl)-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylic acid 3-methyl 5-ethyl ester ?? ?? ? ???

???

?? ??

2,6-Bis(1H-imidazol-1-ylmethyl)-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylic acid 3-methyl 5-ethyl ester ?? ??