Using C1COCCN1, CC(C)(C)OC(=O)NC1CCC(C(=O)O)CC1 to produce CC(C)(C)OC(=O)NC1CCC(C(=O)N2CCOCC2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.