Lamivudine Methylene Dimer Impurity

Chemical Name: 4-(((((2R,5R)-5-((R)-6-amino-2-oxo-2,3-dihydropyridin-3-yl)-1,3-oxathiolan-2-yl)methoxy)methyl)amino)-1-((2R,5S)-2-(hydroxymethyl)-1,3-oxathiolan-5-yl)pyrimidin-2(1H)-one

Smile: O=C1N=C(NCOC[C@H]2SC[C@@H]([C@@H]3C(N=C(N)C=C3)=O)O2)C=CN1[C@H]4O[C@@H](CO)SC4