107829-39-0 114096-06-9 137787-82-7 2,6,7-Trioxabicyclo(2.2.2)octane-3-carbonitrile, 4-(1,1-dimethylethyl)-1-(4-ethynylphenyl)- 4-(1,1-Dimethylethyl)-1-(4-ethynylphenyl)-2,6,7-trioxabicyclo(2.2.2)octane-3-carbonitrile