Flavopiridol. A potent CDK inhibitor, Synonyms:-2-(2-chlorophenyl)-5,7-dihydroxy-8-[(3S,4R)-3-hydroxy-1-methyl-4-piperidinyl]-4-chromenone; HMR 1275; L86-8275; NSC 649890, CAS Number:-146426-40-6, Molecular Formula:-C21H2GClNOG, Purity:-G98% by HPLC, 1mg.