丁二烯

环丁烯

3-butyl-3-azabicyclo[3.2.0]heptane-2,4-dione

cis-1,2-Dibrom-1,2-cyclobutandicarbonsaeure-dimethylester

(+/-)-1,2-dibromo-cyclobutane-1r,2t-dicarboxylic acid dimethyl ester