obsolete trans-4-[2-(3-hydroxy)-thionaphthenyl]-2-oxo-3-butenoate hydratase activity (obsolete GO:0018810)
OBSOLETE. Catalysis of the reaction: trans-4-(2-(3-hydroxy)-thionaphthenyl)-2-oxo-3-butenoate + H2O = pyruvate + 3-hydroxy-2-formylbenzothiophene.