1-Oxa-3,8-diazaspiro(4,5)decane-3-carboxaldehyde, 2,8-dimethyl-, ethanedioate (1:1) 150508-62-6 2,8-Dimethyl-1-oxa-3,8-diazaspiro(4,5)decane-3-carboxaldehyde ethanedioate (1:1) 2,8-Dimethyl-1-oxa-3-formyl-3,8-diazaspiro(4,5)decane hydrogen oxalate