Iso Sildenafil

Chemical Name: 5-[2-Ethoxy-5-[(4-methyl-1-piperazinyl)sulfonyl]phenyl]-2,6-dihydro-2-methyl-3-propyl-7H-pyrazolo[4,3-d]pyrimidin-7-one; 1-[[3-(4,7-Dihydro-2-methyl-7-oxo-3-propyl-2H-pyrazolo[4,3-d]pyrimidin-5-yl)-4-ethoxyphenyl]sulfonyl]-4-methylpiperazine;

Smile: CCCC1=C(N=C(C(C=C([S](=O)(N2CCN(C)CC2)=O)C=C3)=C3OCC)NC4=O)C4=NN1C