Lercanidipine Impurity - C

1,4-Dihydro-2,6-dimethyl-4-(3-nitrophenyl) pyridine-3,5-dicarboxylic acid 2-[N-(3,3-diphenylpropyl)-N-methylamino]-1
,1-dimethyl ethyl propyl diester;  Lercanidipine 5-Desmethyl-5-Propyl Ester ;