30627-51-1 7-Oxabicyclo(2.2.1)heptane-2,3-dicarboxylic acid, m-chlorobenzyl ester, exo-(Z)- BRN 3993667 exo-cis-7-Oxabicyclo(2.2.1)heptane-2,3-dicarboxylic acid m-chlorobenzyl ester