Using NC1(c2cocn2)CC1, O=C(NC1(C(=O)O)CC1)OCc1ccccc1 to produce O=C(NC1(C(=O)NC2(c3cocn3)CC2)CC1)OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.