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3-Oxobetulin acetate is a derivative of the cholesterol biosynthesis inhibitor betulin .1 It inhibits the growth of P388 murine lymphocytic leukemia cells (EC50 = 0.12 μg/ml), as well as human MCF-7 breast, SF-268 CNS, H460 lung, and KM20L2 colon cancer cells (GI50s = 8, 10.6, 5.2, and 12.7 μg/ml, respectively), but not BxPC-3 pancreas or DU145 prostate cancer cells (GI50s = >10 μg/ml for both).2 3-Oxobetulin acetate inhibits replication of X4 tropic recombinant HIV (NL4.3-Ren) in MT-2 lymphoblastoid cells (IC50 = 13.4 μM).3 It is also active against L. donovani amastigotes when used at a concentration of 50 μM.1

1.Alakurtti, S., Bergstr?m, P., Sacerdoti-Sierra, N., et al.Anti-leishmanial activity of betulin derivativesJ. Antibiot. (Tokyo)63(3)123-126(2010) 2.Pettit, G.R., Melody, N., Hempenstall, F., et al.Antineoplastic agents. 595. Structural modifications of betulin and the X-ray crystal structure of an unusual betulin amine dimerJ. Nat. Prod.77(4)863-872(2014) 3.Callies, O., Bedoya, L.M., Beltrán, M., et al.Isolation, structural modification, and HIV inhibition of pentacyclic lupane-type triterpenoids from Cassine xylocarpa and Maytenus cuzcoinaJ. Nat. Prod.78(5)1045-1055(2015)

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