131505-53-8 2,6,7-Trioxabicyclo(2.2.2)octane, 1-(4-ethynylphenyl)-4-(2-methylcyclopropyl)-, trans- trans-1-(4-Ethynylphenyl)-4-(2-methylcyclopropyl)-2,6,7-trioxabicyclo(2.2.2)octane