Structure of Goniomine, an Alkaloid of a New Type Biogenetically Related to Indole Alkaloid. X-Ray Analysis of Dihydrogoniomine1 Sir: We have isolated goniomine (4) [mp 223 °C (methanol), [a]20D -270°( c 0.5, CHCI3)] from Gonioma malagasy Mgf and P. Bt (Apocynaceae),2 following classical alkaloid extraction and purification methods. Goniomine, C19H2202N2, gave the following spectral data: mass spectrum (MS), mje 310 (M+•, 80%), 200
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