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. Author manuscript; available in PMC: 2013 Jul 4.
Published in final edited form as: J Am Chem Soc. 2012 Jun 25;134(26):11006–11011. doi: 10.1021/ja304169n

Figure 1.

Figure 1

Oxidation of G yields OG, the further oxidation of which leads to the hydantoins Gh and Sp. The reaction direction from OG to Gh or Sp depends on pH, temperature, and the surrounding base stack.