Deoxythymidine-5'-triphosphate - 13 C 10 (dTTP- 13 C 10 ) dilithium is 13 C-labeled Deoxythymidine-5'-triphosphate. Deoxythymidine-5'-triphosphate (dTTP) is one of the four nucleoside triphosphates. Deoxythymidine-5'-triphosphate (dTTP)is used in the synthesis of DNA.