Molecular Formula: C23H32N6O4S Formula Weight: 488.6
5-[2-Ethoxy-5[(4-methylpiperazin-1-yl)sulfonyl]phenyl]-1-methyl-3-(2-methylpropyl)-6,7-dihydro-1H-pyrazol[4,3-d]pyrimidin-7-one;Isobutyl sildenafil