Calycosin is an O-methylated isoflavone.

It can be isolated from Astragalus membranaceus Bge.

mongholicus[1] and Trifolium pratense L. (red clover).

[2] Isoflavone 3′-hydroxylase uses formononetin, NADPH, H+ and O2 to produce calycosin, NADP+ and H2O.

This article about an aromatic compound is a stub.