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Representative mass spectra and tandem mass spectra of testosterone monopicolinate and 3α-androstanediol bis-picolinate. Testosterone mono-picolinate (A) and 3α-androstanediol bis-picolinate (B). No mono-picolinate ester with m/z of 398.3 was detected upon 3α-androstanediol derivatization. PA: picolinic acid; Na: sodium.
