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. 2017 May 1;524:56–67. doi: 10.1016/j.ab.2017.01.009

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© 2017 The Authors

This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

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Fig. 6 — Derivatisation reactions for sterol and oxysterol analysis by LC-MS (A) Derivatisation with PTAD. (B) Derivatisation with GP reagent. (C) Left hand side, derivatisation with dimethylglycine; right hand side, derivatisation with nicotinic acid. Abbreviations: DMAP, 4-(dimethylamino)pyridine; DMG, N,N-dimethylglycine; EDC, 1-ethyl-3-(3-dimethyl-aminopropyl) carbodiimide; DPC, N,N-diisopropylcarbodiimide.