1-Oxa-3-azaspiro(4.5)decane-3-carboxylic acid, 7-methyl-2-oxo-, 2-diethylaminoethyl ester, fumarate, (Z)- 74195-89-4 Diethylaminoethyl 7-methyl-2-oxo-1-oxa-3-azaspiro(4.5)decane-3-carboxylate fumarate (Z)- Methyl-7 oxa-1 oxo-2 aza-3 (diethylamino ethoxy carbonyl)-3 spiro(4.5)decane fumarate, (Z)-