西地那非杂质3
QY-XDNF-03
4-Ethoxy-3-(1-methyl-7-oxo-3-propyl-6,7-dihydro-1H-pyrazolo[4,3-d]pyrimidin-5-yl)benzenesulfonyl chloride
139756-22-2
C17H19ClN4O4S