5-(2-ethoxy-5-(N-isopropyloxycarbonyl-aminosulfonyl))-1-methyl-3-propyl-1H-pyrazolo(4,3-d)pyrimidin-7(6H)-one
5-(2-ethoxy-5-(n-isopropyloxycarbonyl-aminosulfonyl))-1-methyl-3-propyl-1h-pyrazolo(4,3-d)pyrimidin-7(6h)-one