30627-48-6 7-Oxabicyclo(2.2.1)heptane-2,3-dicarboxylic acid, m-methoxybenzyl ester, exo-(Z)- BRN 3994997 exo-cis-7-Oxabicyclo(2.2.1)heptane-2,3-dicarboxylic acid m-methoxybenzyl ester