(exo,exo)-Diethyl 7-oxabicyclo(2.2.1)heptane-2,3-dicarboxylate 109282-41-9 5-18-07-00033 (Beilstein Handbook Reference) 7-Oxabicyclo(2.2.1)heptane-2,3-dicarboxylic acid, diethyl ester, (exo,exo)- BRN 1251737