Reaction catalyzed by poly(3-hydroxybutyrate) depolymerase (3.1.1.75)

		+	n	H2O	=		poly (3-hydroxybutanoate) n-1	+
	poly (3-hydroxybutanoate) n	+		n H2O	=		poly (3-hydroxybutanoate) n-1	+		(R)-3-hydroxybutanoate