Using CCOC(=O)C1(CSCc2ccco2)OC(=O)C(O)=C1SCc1ccco1 to produce O=C1OC(CO)(CSCc2ccco2)C(SCc2ccco2)=C1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.