127380-61-4 2-Methyl-7-oxabicyclo(2.2.1)heptane-2,3-dicarboxylic acid (exo,exo)- 2-Methylendothall 7-Oxabicyclo(2.2.1)heptane-2,3-dicarboxylic acid, 2-methyl-, (exo,exo)-