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In the title compound, C 11 H 19 NO 5 , the five-membered pyrrolidine ring adopts an envelope conformation. The dihedral angles between the carboxyl group plane, the pyrrolidine ring and the meth­oxy group are 59.50 (3) and 62.02 (1)°, respectively. In the crystal, inter­molecular O—H⋯O hydrogen bonds link the mol­ecules into chains along [100]. The absolute configuration is assigned in accord with that of (2 R ,4 R )-1-( tert -but­oxy­carbon­yl)-4-hy­droxy­pyrrolidine-2-carb­oxy­lic acid, which was the starting material in the synthesis.

(2R,4R)-1-(tert-Butoxycarbonyl)-4-methoxypyrrolidine-2-carboxylic acid