VINPOCETINE IMPURITY B (13AS,13BS)-13A-ETHYL-2,3,5,6,13A,13B-HEXAHYDRO-1H-INDOLO[3,2,1-DE]PYRIDO[3,2,1-IJ][1,5]NAPHTHYRIDINE-12-CARB OXYLATE (APOVINCAMINE) 1 * 10 mg