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Diels–Alder reaction between 4-carboxybenzyl-trans-1,3-butadiene-1-carbamate (1) and N,N-dimethylacrylamide (2). The theozyme for promoting formation of the 3R,4S endo cyclohexene product (3) is shown in brackets. The phosphorylated product analog (4) was used for inhibition and crystallization experiments.
