(2-endo,3-exo)-2-Bromo-7-oxabicyclo(2.2.1)heptane-2,3-dicarboxylic acid 109282-28-2 7-Oxabicyclo(2.2.1)heptane-2,3-dicarboxylic acid, 2-bromo-, (2-endo,3-exo)-