Catalogue Number:  | S-0646  | 
Compound Name:  | Sildenafil EP Impurity A (Sildenafil USP Related Compound A, Isobutyl Sildenafil)  | 
Synonyms:  | 5-(2-ethoxy-5-((4-methylpiperazin-1-yl)sulfonyl)phenyl)-3-isobutyl-1-methyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one  | 
CAS#:  | 1391053-95-4  | 
Alternate CAS#:  | |
Molecular Formula:  | C23H32N6O4S  | 
Molecular Weight:  | 488.61  | 
Sildenafil Analogue I (Propoxyphenyl-Thiohydroxyhomo Sildenafil)
CAS No. 479073-90-0
C24H34N6O4S2
M.W. 534.69