134133-92-9 2,6,7-Trioxabicyclo(2.2.2)octan-4-amine, N,N-dimethyl-1-(4-ethynylphenyl)- N,N-Dimethyl-1-(4-ethynylphenyl)-2,6,7-trioxabicyclo(2.2.2)octan-4-amine