European Pharmacopoeia (EP) Reference Standard Synonym(s): Methoxyvinpocetine; Ethyl (13a S ,13b S )-13a-ethyl-9-methoxy-2,3,5,6,13a,13b-hexahydro-1 H -indolo[3,2,1-de]pyrido[3,2,1- ij ][1,5]naphthyridine-12-carboxylate Empirical Formula: C23H28N2O3...