Barnidipine Impurity 1

Chemical Name: Bis((S)-1-benzylpyrrolidin-3-yl) 2,6-dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate oxalate

Smile: O=C(C1=C(C)NC(C)=C(C(O[C@]2([H])CN(CC3=CC=CC=C3)CC2)=O)C1([H])C4=CC=CC([N+]([O-])=O)=C4)O[C@@]5([H])CCN(CC6=CC=CC=C6)C5.O=C(O)C(O)=O