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. Author manuscript; available in PMC: 2026 Apr 5.
Published in final edited form as: J Chromatogr A. 2026 Jan 21;1769:466721. doi: 10.1016/j.chroma.2026.466721

Fig. 4.

Fig. 4.

Fig. 4.

MS2 spectra of internal standards: (A) 2-dC-13C,15N2, (B) 5-mdC-d3, and (C) 5-hmdC-d3 on a Triple Quad LC–MS/MS for the identification of isotope-labeled nucleoside internal standards.