2 2 4 4 tetramethylcyclobutane 1 3 dione July 8, 2019 16 32 64 128 2 4 4 6-tetrabromocyclohexa-2 5-dien-1-one 2 4 4 6-tetrabromo-2 5-cyclohexadienone 1 4 dibromobutane 2 3 4 5-tetramethyl-2-cyclopentenone
