5-(3-ethoxy-2-thienyl)-1-methyl-3-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one 7H-pyrazolo[4,3-d]pyrimidin-7-one, 5-(3-ethoxy-2-thienyl)-1,6-dihydro-1-methyl-3-propyl- InChI=1/C15H18N4O2S/c1-4-6-9-11-12(19(3)18-9)15(20)17-14(16-11)13-10(21-5-2)7-8-22-13/h7-8H,4-6H2,1-3H3,(H,16,17,20