Calycosin
# Calycosin

Calycosin is an O-methylated isoflavone. It can be isolated from Astragalus membranaceus Bge. var. mongholicus and Trifolium pratense L. (red clover).

## Biosynthesis

Isoflavone 3′-hydroxylase uses formononetin, NADPH, $H^+$ and $O_2$ to produce calycosin, $NADP^+$ and $H_2O.$

