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- [23] 1α,25-dihydroxyvitamin D3 A-ring precursors:: Studies on regioselective enzymatic alkoxycarbonylation reactions of their stereoisomers.: Chemoenzymatic synthesis of A-ring synthon carbamate derivatives, including carbazates and polyamino carbamates JOURNAL OF ORGANIC CHEMISTRY, 1999, 64 (20): : 7504 - 7510