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. Author manuscript; available in PMC: 2009 Aug 12.
Published in final edited form as: J Neurosci. 2008 Jun 18;28(25):6407–6418. doi: 10.1523/JNEUROSCI.1425-08.2008

Figure 3. Structures of SS427 and cort21S and identity of SS425 and cort21S by mass spectrometry.

Figure 3

(A) Structure of 4-pregnene-11,20,21-triol-3-one 21-sulfate (SS427)

(B) Structure of corticosterone 21-sulfate

(C) - (F) Mass spectrometry of cort21S and SS425 reveal identical fragmentation patterns with two different instruments. (C) and (D) A triple quadrupole instrument was used and identical fragments were observed for SS425 (C) and cort21S (D). (E) and (F) An ion trap instrument was used and identical fragments were observed for SS425 (E) and cort21S (F)