The known flemingins A-C (1-3) and nine new chalcones, named flemingins G-O (4-12), along with deoxyhomoflemingin (13) and emodin (14) were isolated from a leaf extract of Flemingia grahamiana. The isolated chalcones were found to have a geranyl substituent modified into a chromene ring possessing a
Aromatase is the key enzyme responsible for catalyzing the conversion of C19 steroids to estrogens. Its inhibitors are widely used in breast cancer therapy. The CH2 Cl2 partition of a crude ethanolic extract from the roots of Flemingia philippinensis showed potent inhibitory activity of aromatase.
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