VINPOCETINE IMPURITY D (12RS,13ARS,13BRS)-13A-ETHYL-2,3,5,6,12,13,13A,13B-OCTAHYDRO-1H-INDOLO[3,2,1-DE]PYRIDO[3,2,1-IJ][1,5]NAPHTHYR IDINE-12-CARBOXYLATE (DIHYDROVINPOCETINE) 1 * 10 mg