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. Author manuscript; available in PMC: 2014 Jul 14.
Published in final edited form as: Science. 2013 Sep 26;342(6156):347–351. doi: 10.1126/science.1243192

Fig. 3. Proposed acid-catalyzed reversible photohydration of 17α-TBOH.

Fig. 3

Dashed green arrows indicate pathways that break the product-to-parent reversion cycle. Red highlights detail the changes in the trienone structure during photolysis and subsequent dehydration.