The EtOH extract of the leaves of Tabernamontuna diuaricata (single flower
variety) provides, in addition to voacangine, voacristine, voacristine-7-hydroxyindolenine,
apparicine, and 19+-voacristine, two new dimeric alkaloids: conophylline 111 and conophyllidine
C27. The structures of the dimeric alkaloids were established by spectral methods and subsequently
confirmed by X-ray analysis