What sugar units make up the structure shown?           D-Iduronate and N-Acetyl-D-galactosamine-6-sulfate     D-Glucuronate and N-Acetyl-D-glucosamine-6-sulfate     D-Glucuronate and N-Sulfo-D-glucosamine-6-sulfate     D-Glucuronate and N-Acetyl-D-galactosamine-6-sulfate

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