西地那非 EP 杂质 D
QY-XDNF-D
4-Ethoxy-3-(1-methyl-7-oxo-3-propyl-6,7-dihydro-1H-pyrazolo[4,3-d]pyrimidin-5-yl)benzenesulfonic acid
1357931-55-5
C17H20N4O5S