1-Oxa-3-azaspiro(4.4)nonane-3-carboxylic acid, 2-oxo-, 2-dimethylaminoethyl ester, hydrochloride 2-Oxo-1-oxa-3-azaspiro(4.4)nonone-3-carboxylic acid dimethylaminoethyl ester hydrochloride 24247-73-2 Oxa-1 oxo-2 aza-3 (dimethylamino ethoxy carbonyl)-3 spiro(4.4)nonane chlorhydrate