((S)-(-)-8-(3-Oxocyclopentyl)-1,3-dipropyl-7H-purine-2,6-dione) 133058-72-7 1H-Purine-2,6-dione, 3,7-dihydro-8-(3-oxocyclopentyl)-1,3-dipropyl- Biip 20 Kfm 19 Kfm-19