108614-30-8 2,6,7-Trioxabicyclo(2.2.2)octane, 4-(2,2-dimethylpropyl)-1-(4-ethynylphenyl)- 4-(2,2-Dimethylpropyl)-1-(4-ethynylphenyl)-2,6,7-trioxabicyclo(2.2.2)octane