西地那非 EP 杂质 G
QY-XDNF-G
5,5'-((piperazine-1,4-disulfonyl)bis(6-ethoxy-3,1-phenylene))bis(1-methyl-3-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one)
1346602-67-2
C38H46N10O8S2