Using O=C(O)c1c[nH]c2ccccc12, OCC12CCCN(CCC1)C2 to produce O=C(OCC12CCCN(CCC1)C2)c1c[nH]c2ccccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.