| GO | Name |
| GO:0004423 | iduronate-2-sulfatase activity |
| GO:0005509 | calcium ion binding |
| GO:0005764 | lysosome |
| GO:0006027 | glycosaminoglycan catabolic process |
| GO:0008484 | sulfuric ester hydrolase activity |
| GO:0030207 | chondroitin sulfate catabolic process |
| GO:0043202 | lysosomal lumen |