139756-24-4

3-(6,7-Dihydro-1-methyl-7-oxo-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-5-yl)-4-propoxybenzenesulfonyl Chloride is an intermediate used in the synthesis of O-Desethyl-O-propyl Methisosildenafil (D289495), which is an analogue of the selective type of 5cGMP phosphodiesterase inhibitor, Sildenafil (S435000).