1,2-Bde 1,2-Dihydroxy-3,4-epoxide-1,2,3,4-tetrahydrobenzene 3,4-Epoxy-1,2,3,4-tetrahydrobenzene-1,2-diol 7-Oxabicyclo(4.1.0)hept-4-ene-2,3-diol 77209-76-8