Using CCOC(=O)c1cc2sc3c(c2[nH]1)CCN(C(=O)OCC)CC3 to produce CCOC(=O)N1CCc2sc3cc(C(=O)O)[nH]c3c2CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.