西地那非 EP 杂质 C
QY-XDNF-C
5-(2-Hydroxy-5-((4-methylpiperazin-1-yl)sulfonyl)phenyl)-1-methyl-3-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one
139755-91-2
C20H26N6O4S