西地那非 EP 杂质 F
QY-XDNF-F
5-(2-Ethoxy-5-(piperazin-1-ylsulfonyl)phenyl)-1-methyl-3-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one
139755-82-1
C21H28N6O4S