3′-O-N3-dATP trisodium (3′-O-Azidomethyl dATP trisodium) is the trisodium salt form of 3′-O-N3-dATP. 3′-O-N3-dATP trisodium is a modified nucleotide, which is utilized for DNA polymerase. 3′-O-N3-dATP trisodium acts as reversible terminator with enhanced raman scattering (SERS) at 2125 cm -1 , which determines the DNA sequences continuously.