The molecule is a 2',3'-dideoxyribonucleoside triphosphate oxoanion obtained from 2',3'-dideoxythymidine triphosphate by deprotonation of three of the four free triphosphate OH groups; major species at pH 7.3. It is a conjugate base of a ddTTP.
[[[(2S,5R)-5-(5-methyl-2,4-dioxopyrimidin-1-yl)oxolan-2-yl]methoxy-oxidophosphoryl]oxy-oxidophosphoryl] phosphate