(±) Erysectin A, a new isoprenylated isoflavone with a rare acetonyl group from Erythrina secundiflora Hassk.

(±) Erysectin A (1), a new isoprenylated isoflavone with a rare acetonyl group, along with 15 known compounds including eight isoprenylated isoflavones (2-9), two isoprenylated flavanones (10-11), three flavanones (12-14), a flavone (15), and a chalcone (16), was isolated from the twigs and leaves of Erythrina secundiflora Hassk. Their structures were identified based on their 1 D and 2 D NMR spectral data. All the compounds were isolated from this plant for the first time. Compound 1 showed moderate cytotoxicity on several cancer cell lines.[Formula: see text].