(R)-Roscovitine 1-Butanol, 2-[[9-(1-methylethyl)-6-[(phenylmethyl)amino]-9H-purin-2-yl]amino]-, (2R)- 186692-46-6 2-[[9-(1-Methylethyl)-6-[(phenylmethyl)amino]- 9H-purin-2-yl]amino]-(R)-1-butanol NSC701554 Roscovitine