Abstract
Abstract
13α,21-Dihydroeurycomanone (1), a known quassinoid of EURYCOMA LONGIFOLIA Jack was recrystallized from chloroform into a novel crystal structure in space group P2
1
. Its X‐ray data were compared with those of eurycomanone (2). Following intraperioneal injections at similar doses of 2.44 µmol/kg/day for 3 consecutive days, 2 displayed comparable potency with tamoxifen but was more potent than 1 in the anti-estrogenic effect against 17α-ethynylestradiol (EE)-induced uterotrophy of immature rats.