ethyl 4-hydroxyspiro[bicyclo[2.2.2]octane-2,2'-[1,3]dithiolane]-1-carboxylate

4-bromo-bicyclo[2.2.2]octane-1-carboxylic acid ethyl ester

对苯二甲酸

1,4-dibromo-trans-cyclohexane-1,4-dicarboxylic acid dimethyl ester