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Unstable folate species and stabilized derivatives. (A) pH dependent equilibrium of folates carrying one-carbon units at the formic acid oxidation level. (B) General structure of the folate backbone. (C) Dimethylated folate without isotopic labels can be employed as an internal standard. (D–K) Derivatives of 5-formyl THF, 10-formyl THF, 5-methyl THF, 5,10-methylene THF, 5,10-methenyl THF, THF, DHF, and folic acid.
