 The mechanism of ring closure is complex, but involves an aldol condensation at C-2 and C-7.It has the same structure as quinic acid, which is found in coffee, but the C-3 hydroxyl is oxidized to a ketone group.3-Dehydroquinic acid undergoes five further enzymatic steps in the remainder of the shikimate pathway to chorismic acid, a precursor to tyrosine, 3-phenylalanine, tryptophan, and some vitamins, including