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. 2010 Sep 13;107(39):16788–16793. doi: 10.1073/pnas.1010015107

Scheme 1.

Scheme 1.

Proposed mechanism for extradiol dioxygenases. In the case of 2,3-HPCD, R is -CH2COO- and B is His200. When R is -NO2 and His200 is changed to Asn, the reaction stalls before reaching intermediate C. Peroxide is slowly released and the product is 4NC quinone.