135446-13-8 2,5,6,9-Tetrahydro-8-cyclopentyl-6-n-propyl-3H-1,2,4-triazolo(3,4-i)purine-3,5-dione 3H-1,2,4-Triazolo(3,4-i)purine-3,5(2H)-dione, 6,7-dihydro-8-cyclopentyl-6-propyl- 6,7-Dihydro-8-cyclopentyl-6-propyl-3H-1,2,4-triazolo(3,4-i)purine-3,5(2H)-dione