4,7-Methano-1,3-dioxolo[4,5-c]pyridine-5(4H)-carboxylic acid, tetrahydro-2,2-diMethyl-6-oxo-, 1,1-diMethylethyl ester, (3aS,4R,7S,7aR)-
4,7-METHANO-1,3-DIOXOLO[4,5-C]PYRIDINE-5(4H)-CARBOXYLIC ACID, TETRAHYDRO-2,2-DIMETHYL-6-OXO-, 1,1-DIMETHYLETHYL ESTER, (3AS,4R,7S,7AR)-