The hydroxyl group can be oxidized to the formyl group (aldehyde) to obtain the α-substituted β-formyl δ-lactone.
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(3S,4R)-3-benzyl-2-oxotetrahydro-2H-pyran-4-carbaldehyde
1H-Pyrrole-1-carboxylic acid, 2-[(benzoyloxy)methyl]-5-[(ethoxycarbonyl)amino]-2,5-dihydro-, ethyl ester, cis-