Four urea derivatives were isolated from the roots of Pentadiplandra brazzeana, and their structures were elucidated by spectroscopic techniques. N-Benzyl-N'-(4-methoxybenzyl)urea (1) is a new compound, although N,N'-di-(4- methoxybenzyl)urea (2), N,N'-dibenzylurea (3), and p-methoxythiobenzaldehyde (4) are reported from a natural source for the first time.

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Journal Journal of Natural Products
Tsopmo, A, Ngnokam, D. (David), Ngamga, D. (Dieudonné), Ayafor, J.F. (Johnson F.), & Sterner, O. (Olov). (1999). Urea derivatives from Pentadiplandra brazzeana. Journal of Natural Products, 62(10), 1435–1436. doi:10.1021/np990111f