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. Author manuscript; available in PMC: 2015 Jan 8.
Published in final edited form as: Free Radic Biol Med. 2013 Jun 6;66:10.1016/j.freeradbiomed.2013.05.045. doi: 10.1016/j.freeradbiomed.2013.05.045

Fig 3.

Fig 3

Michael addition. Some dietary antioxidants contain α,β-unsaturated carbonyls. Others are oxidized to form the similar structures. The electrophilic α,β-unsaturated carbonyl or isocyanate of sulforaphane can react in a Michael addition with the thiolate of the critical cysteine of Keap1.