1 HZ3 Dimethyl (1r,4s)-5,6-bis(4-hydroxyphenyl)-7-oxabicyclo[2.2.1]hepta-2,5-diene-2,3-dicarboxylate 1.000 2 ODE Diethyl (1r,2s,3r,4s)-5,6-bis(4-hydroxyphenyl)-7-oxabicyclo[2.2.1]hept-5-ene-2,3-dicarboxylate 0.935