Sildenafil citrate 50MG. Sildenafil citrate,CAS: 171599-83-0,MF: C22H30N6O4S. C6H8O7,Purity: greater than or equal to 98%,Appearance: White solid,Synonym: 1-[[3-(4,7-Dihydro-1-methyl-7-oxo-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-5-yl)-4-ethoxyphenyl]sulfonyl]-4-methylpiperazine citrate,Size: 50MG