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The major alkaloid of Dracontomelum mangiferum Bl. (family Anacardiaceae) has been identified as (-)-1,2,3,4,6,7-hexahydro-12H- indolo[2,3-a]quinolizine, which has not been found previously in nature although the (±) form has been synthesized.
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Johns et al. (1966) studied this question.
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