Emtricitabine Impurity 18

Chemical Name: ((((R)-1-(6-((((5-fluoro-1-((2R,5S)-2-(hydroxymethyl)-1,3-oxathiolan-5-yl)-2-oxo-1,2-dihydropyrimidin-4-yl)amino)methyl)amino)-9H-purin-9-yl)propan-2-yl)oxy)methyl)phosphonic acid

Smile: O=C1N([C@H]2O[C@@H](CO)SC2)C=C(F)C(NCNC3=C4C(N(C[C@@H](C)OCP(O)(O)=O)C=N4)=NC=N3)=N1