2-Oxo-1-oxa-3-azaspiro(4.6)undecane-3-carboxylic acid dimethylaminoethyl ester hydrochloride 3-Oxa-1-azaspiro(4.6)undecane-3-carboxylic acid, 2-oxo-, dimethylaminoethyl ester, hydrochloride 5175-99-5 Oxa-1 oxo-2 aza-3 (dimethylamino ethoxy carbonyl)-3 spiro(4.6)undecane chlorhydrate