Using CC(C)CN, CCOC(=O)C(OCC)c1c(F)cc(C(=O)O)cc1F to produce CCOC(=O)C(OCC)c1c(F)cc(C(=O)NCC(C)C)cc1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.