Similar names: 7H-Pyrazolo[4,3-d]pyrimidine-7-thione, 5-[5-[[(3R,5S)-3,5-dimethyl-1-piperazinyl]sulfonyl]-2-ethoxyphenyl]-1,6-dihydro-1-methyl-3-propyl-, rel-; Piperazine, 1-[[3-(4,7-dihydro-1-methyl-3-propyl-7-thioxo-1H-pyrazolo[4,3-d]pyrimidin-5-yl)-4-ethoxyphenyl]sulfonyl]-3,5-dimethyl-, (3R,5S)-rel- (9CI); Sulfoaildenafil; Thioaildenafil; rel-5-[5-[[(3R,5S)-3,5-Dimethyl-1-piperazinyl]sulfonyl]-2-ethoxyphenyl]-1,6-dihydro-1-methyl-3-propyl-7H-pyrazolo[4,3-d]pyrimidine-7-thione; Thiomethisosildenafil