2,3-Indolobetulonicacid is pentacyclic triterpenoid derivative of betulonic acid and an inhibitor of α-glucosidase (IC50= 1.8 μM).1 1.Khusnutdinova, E.F., Smirnova, I.E., Kazakova, O.B., et al.Synthesis and evaluation of 2,3-indolotriterpenoids as new α-glucosidase inhibitorsMed. Chem. Res.262732-2742(2017)