Chemical Name: 1-((2R,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl-13C)tetrahydrofuran-2-yl-2,3,4,5-13C4)-5-methylpyrimidine-2,4(1H,3H)-dione
Synonym: [1',2',3',4',5'-13C5]ribothymidine ; 5-methyl-[1',2',3',4',5'-13C5]uridine
Smile: O=C1NC(C(C)=CN1[13C@@H]2O[13C@@H]([13CH2]O)[13C@@H](O)[13C@@H]2O)=O