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. Author manuscript; available in PMC: 2012 Oct 25.
Published in final edited form as: Biochemistry. 2011 Sep 28;50(42):9135–9147. doi: 10.1021/bi2012178

Scheme 2.

Scheme 2

The fragment ions observed in the MSn spectra of the major hydroxyphthioceranoic acid substituents in SL-II and the proposed fragmentation pathways leading to the ion formation and structure identification. The structures of the indicated fragment ions are supported by high-resolution LIT MSn experiments (data not shown).