Antineoplastic alkaloid compound, and its medicine composition, preparation method and application

The invention provides vobasine-iboga type alkaloid compound ervachinines A-D (1-4) with antineoplastic activities, its preparation method, a medicine composition containing the alkaloid compound, and an application of the alkaloid compound and the medicine composition in preparation of antineoplastic drugs, wherein structural formulas of the vobasine-iboga type alkaloid compound ervachinines A-D are shown as the formulas of 1 to 4.