Stem bark of Cassia siamea Lam. were collected from Mindouli(Pool, Congo) in May 2007, based on information given by the tradipractitioners. Plant material was identified by the botanists of Centre d’Etudes sur les Ressources Végétales (CERVE), Brazzaville-Congo. A voucher specimen has been deposited at the Herbarium of the Laboratory of Botany of the CERVE under the number NN0701