1N5C:
reference: Crystallographic characterization of an exocyclic DNA adduct: 3,N4-etheno-2'-deoxycytidine in the dodecamer 5'-CGCGAATTepsilonCGCG-3'., Freisinger E, Fernandes A, Grollman AP, Kisker C, J Mol Biol 2003 Jun 13;329(4):685-97. PMID: 12787670

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