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Typical ultrahigh-performance liquid chromatograms (UHPLC) of (A) mixed standards and (B) representative sample with multiple reaction monitoring (MRM) method (1) Cytosine; (2) Uracil; (3) Thymine; (4) Adenine; (5) Hypoxanthine; (6) Guanine; (7) Uridine; (8) 2′-Deoxyuridine; (9) Cordycepin; (10) Thymidine; (11) Adenosine; (12) Guanosine; (13) Inosine; and 2-chloroadenosine (internal standard, IS).
