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2,6,7-Trioxabicyclo[2.2.2]octane,1-(4-ethynylphenyl)-4-(2-fluorophenyl)-;
2,6,7-Trioxabicyclo(2.2.2)octane, 1-(4-ethynylphenyl)-4-(2-fluoropheny l)-

2,6,7-Trioxabicyclo[2.2.2]octane,1-(4-ethynylphenyl)-4-(4-fluorophenyl)-;
2,6,7-Trioxabicyclo(2.2.2)octane, 1-(4-ethynylphenyl)-4-(4-fluoropheny l)-

2,6,7-Trioxabicyclo[2.2.2]octane,1-(4-ethynylphenyl)-4-(3-fluorophenyl)-;
2,6,7-Trioxabicyclo(2.2.2)octane, 1-(4-ethynylphenyl)-4-(3-fluoropheny l)-

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