methypiperazinyl,sildenafil,dimer,impurity,piperazinyl
Piperazinyl
635719-17-4Benzamide,3-[[7-(2-butynyl)-6,7-dihydro-1-methyl-6-oxo-8-(1-piperazinyl)-1H-purin-2-yl]oxy]-, mono(trifluoroacetate)
63422-71-9(D-)-alpha-[[(4-Ethyl-2,3-dioxo-1-piperazinyl) carbonyl]amino]-2-(4-hydroxyphenyl) acetic acid