1 PVB Purvalanol B 1.000 2 P01 2-({6-[(3-chlorophenyl)amino]-9-isopropyl-9h-purin-2-yl}amino)-3-methylbutan-1-ol 0.900 3 AP9 (2s)-2-({6-[(3-amino-5-chlorophenyl)amino]-9-isopropyl-9h-purin-2-yl}amino)-3-methylbutan-1-ol 0.871 4 OLP 2-(2-hydroxyethylamino)-6-(3-chloroanilino)-9-isopropylpurine 0.800