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Structures and mass spectra of the 1,N6-etheno-2’-deoxyadenosine and 3,N4-etheno-2’-deoxycytidine standards and [15N5]-1,N6-etheno-2’-deoxyadenosine and [15N3]-3,N4-etheno-2’-deoxycytidine as internal standards (I.S.). (A) εdA; (B) [15N5]εdA; (C) εdC; (D) [15N3]εdC.
