()-Liquiritigenin (()-4,7-Dihydroxyflavanone), a flavonoid extracted from Angelica keiskei, inhibits the calcium-activated chloride channel TMEM16A.()-Liquiritigenin induces an increase in apoptosis and an enhancement of caspase3 activity. ()-Liquiritigenin induces increased apoptosis and enhanced caspase3 activity. ()-Liquiritigenin is used in breast cancer research.