Using CCOC(=O)CC(=O)Nc1scc(-c2ccccc2)c1C(=O)OCC to produce CCOC(=O)c1c(O)c2c(-c3ccccc3)csc2[nH]c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.