Using COC(=O)C[C@@H]1COc2cc(O)ccc21, Cc1c(C)c(-c2cccc(CO)c2)c(C)c(C)c1OCCCS(C)(=O)=O to produce COC(=O)C[C@@H]1COc2cc(OCc3cccc(-c4c(C)c(C)c(OCCCS(C)(=O)=O)c(C)c4C)c3)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.