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( RS )-(±)-2-Methoxy­carbonyl-3-tropinone is an important inter­mediate for the preparation of cocaine and its derivatives. The molecule in the title compound, C 10 H 16 NO 3+ ·C 4 H 5 O 6− , is present as the enol tautomer. The six-membered ring adopts a half boat conformation, and the five-membered ring a slightly distorted envelope conformation. There are intra- and inter­molecular hydrogen bonds involving the hydroxyl, carboxyl groups and quaternary ammonium groups.

(R)-(+)-3-Hydroxy-2-methoxycarbonyl-8-methyl-8-azoniabicyclo[3.2.1]octaneL-bitartrate