1,4-Dimethyl-7-oxabicyclo(2.2.1)heptane-2,3-dicarboxylic acid (exo,exo)- 109282-27-1 7-Oxabicyclo(2.2.1)heptane-2,3-dicarboxylic acid, 1,4-dimethyl-, (exo,exo)-