Using O=CO, C=CC(C)c1cc(C)c2c(c1O)C(NC)C1CCCCC21 to produce C=CC(C)c1cc(C)c2c(c1O)C(N(C)C=O)C1CCCCC21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.