Catalysis of the reaction: 5-(4-acetoxybut-1-ynyl)-2,2'-bithiophene + H2O = 5-(4-hydroxy-but-1-ynyl)-2,2'-bithiophene + acetate + H+.
5-(4-acetoxy-1-butynyl)-2,2\'-bithiophene:acetate esterase activity