Chemical Name: (S)-2-methoxy-2-((R)-7-oxo-1,2,5,7-tetrahydro-4H-furo[3,4-d][1,3]thiazin-2-yl)-2-(2-(thiophen-2-yl)acetamido)acetamide
Synonym: Capecitabine 2-Methylbutyloxy Impurity
Smile: O=C(CC1=CC=CS1)N[C@@](C(N)=O)(OC)[C@]2([H])NC(C(OC3)=O)=C3CS2