" The leaves of Horsfieldia superba (Hk. f. et. Th.) Warb. Were collected at Sandakan (Sabah, Malaysia) in September 1986. A voucher specimen (David 255) was deposited at the Laboratoire de Phanerogamie, Museum National d’Histoire Naturelle, Paris France. The dried and powdered material (2.8 kg) was made basic with aqueous NH₃ (10%) and extracted with CH₂Cl₂ in a Soxhlet apparatus until the Mayer test was negative. The organic phases were extracted with HCl (5%) and the acidic solutions were made basic with aqueous NH₃ (25%) and extracted with CH₂Cl_2. Concentration of the organic layer to dryness gave the crude alkaloids (1.9 g). A rough separation was obtained by column chromatography (SiO2; CH2Cl2/MeOH/aqueous NH3, 92/8/0.5). Further purification, on preparative TLC or crystallization, afforded pure compounds, 1, [Horsifiline (5-methoxy-2’-methylspiro[3H-indole-5,5’-pyrrolidin]-2(1H)-one)] (1.050 g, 0.037%), 2, [6-methoxy-2-methyl-1,2,3,4-tetrahydro-b -carboline] (0.230 g, 0.008%), and 3, [5-methoxy-N,N-dimethyltryptamine] (0.020 g, 0.0007%)."