1. From the epigeal part of the plant Dipthychocarpus strictus collected in the flowering period close to Dzhilga, Chimkent oblast, the new alkaloids diptocarpiline and diptocarpidine have been isolated. 2. In a study of some chemical transformations and the spectral characteristics, it has been established that diptocarpiline has the structure of 6-methylsulfinyl-6′-methylthio-N,N′-di-n-hexylurea, and diptocarpidine that of 6,6-′-di(methylsulfinyl)-N,N′-di-n-hexylurea. © 1978 Plenum Publishing Corporation.