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. Author manuscript; available in PMC: 2019 Sep 15.
Published in final edited form as: J Chromatogr B Analyt Technol Biomed Life Sci. 2018 Jul 20;1095:112–118. doi: 10.1016/j.jchromb.2018.07.017

Scheme 1.

Scheme 1

Derivatization of (A) HGA and (B) MCPG with dansyl chloride. Asterisks indicate 13C and 15N label sites on the internal standards.