Using CCOC(=O)c1cc(OC)c2c3ncccc3c(=O)n(COC)c2c1 to produce CCOC(=O)c1cc(OC)c2c3c(c(=O)n(COC)c2c1)CCCN3, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.