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Structures of 4-OHEN–DNA adducts and their stereoisomers. 4-OHEN–dA and 4-OHEN–dC form similar stereoisomers with four different types. dA1/dC1, 4-OHEN–dA1/4-OHEN–dC1; dA2/dC2, 4-OHEN–dA2/4-OHEN–dC2; dA3/dC3, 4-OHEN–dA3/4-OHEN–dC3; dA4/dC4, 4-OHEN–dA4/4-OHEN–dC4.
