30627-52-2 7-Oxabicyclo(2.2.1)heptane-2,3-dicarboxylic acid, p-chlorobenzyl ester, exo-(Z)- BRN 3993685 exo-cis-7-Oxabicyclo(2.2.1)heptane-2,3-dicarboxylic acid p-chlorobenzyl ester