The enzyme 5-(3,4-diacetoxybut-1-ynyl)-2,2′-bithiophene deacetylase (EC 3.1.1.66) catalyzes the reaction5-(3,4-diacetoxybut-1-ynyl)-2,2′-bithiophene + H2O 5-(3-hydroxy-4-acetoxybut-1-ynyl)-2,2′-bithiophene + acetate