Phenolic constituents of licorice. II. Structures of licopyranocoumarin, licoarylcoumarin and glisoflavone, and inhibitory effects of licorice phenolics on xanthine oxidase.
Five phenolics isolated from licorice inhibited the cytopathic activity of a human immmunodeficiency virus. One of these a coumarin derivative named licopyranocoumarin, isolated from Xi-bei licorice, had structure 5, based on the chemical and spectroscopic evidence.