Broad-specificity glycosaminoglycan lyase, which acts in an exolytic fashion degrading chondroitin sulfates and dermatan sulfate to yield only disaccharide products. Has a preference for chondroitin 4-sulfate over chondroitin 6-sulfate. Has extremely low activity against hyaluronic acid. Is not active against acharan sulfate, heparin or heparan sulfate. Exolytic removal of Delta(4)-unsaturated disaccharide residues from the non-reducing ends of both polymeric chondroitin/dermatan sulfates and their oligosaccharide fragments. Divalent metal cation. Requires divalent metal cation for binding of dermatan sulfate substrate, whereas it is not necessary for the binding of chondroitin sulfate substrates. Prefers Ca(2+) or Mg(2+), binding 1 ion per subunit. Monomer. Belongs to the polysaccharide lyase 8 family.