Invalid SMILES

could not parse 'CC1(OC@@H2COC@@3(C@H(C@@H2O1)OC(O3)(C)C)COS(=O)(=O)N)C', unexpected character
CC1(OC@@H2COC@@3(C@H(C@@H2O1)OC(O3)(C)C)COS(=O)(=O)N)C
      ^