Using CCOC(C)=O, O=C(CCc1ccco1)NCCC(=O)C1CCCC1 to produce CCOC(=O)CC(O)(CCNC(=O)CCc1ccco1)C1CCCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.