New alkaloids with mp 57-59°C and diptamine have been isolated from the seeds and epigeal part of Dipthychocarpus strictus collected in Chimkent Province (KazSSR). It has been established that the base with mp 57-59°C has the structure of N,N′-di(6-methylthiohexyl)urea, while diptamine is N-isopropyl-N′-(7-methylsulfonylheptyl)urea. © 1980 Plenum Publishing Corporation.