Summary: Flavopiridol hydrochloride competes with ATP to inhibit CDKs including CDK1, CDK2, CDK4 and CDK6 with IC50 of ~ 40 nM. It is 7.5-fold more selective for CDK1/2/4/6 than CDK7. Flavopiridol is initially found to inhibit EGFR and PKA. https://www.bocsci.com/flavopiridol-hydrochloride-cas-131740-09-5-item-83124.html