Sildenafil D8

Chemical Name: 5-(2-Ethoxy-5-((4-methylpiperazin-1-yl-2,2,3,3,5,5,6,6-d8)sulfonyl)phenyl)-1-methyl-3-propyl-1,4-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one

Smile: O=C1C(N(C)N=C2CCC)=C2NC(C3=CC(S(=O)(N4C([2H])([2H])C([2H])([2H])N(C)C([2H])([2H])C4([2H])[2H])=O)=CC=C3OCC)=N1