(6aR,9aS)-5,6a,7,8,9,9a-hexahydro-5-methyl-2,3-bis(phenylmethyl)cyclopent-[4,5]imidazo-[2,1-b]purin-4(3H)-one

7,8-Dibenzyl-2-((1R,2R)-2-hydroxy-cyclopentylamino)-1-methyl-1,7-dihydro-purin-6-one