29745-06-0 7-Oxabicyclo(2.2.1)heptane-2,3-dicarboxylic acid, isopropyl ester, exo-(Z)- BRN 3963682 exo-cis-7-Oxabicyclo(2.2.1)heptane-2,3-dicarboxylic acid isopropyl ester