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. Author manuscript; available in PMC: 2009 Apr 2.
Published in final edited form as: Biochemistry. 2008 Dec 30;47(52):14009–14019. doi: 10.1021/bi801392j

Scheme 1.

Scheme 1

Fragmentation Processes Proposed for the [M − H] Ion of 4-Pregnene-11β,20,21-triol-3-one 21-Sulfate (SS427)a

a The m/z values of the analogous ions that give mass shifts arising from 34S-, 2H2-, and 34S- and 2H2-labeled isotopologues are shown after a slash. The slash and m/z values are not shown if MSn experiments with the isotopologues were not performed.