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Structures of guanine‐cytosine base pairs and ethylene oxide (EO)‐induced adducts: N7‐HEG and O6‐HEG (SN2 reaction). Disrupted hydrogen bonding (− − ‐) shown for O6‐HEG, which is unaffected for N7‐HEG. N7‐HEG adducts comprise the majority (>95%) of EO‐induced adducts.
