Using O=C(O)CC1NC(=O)NC1=O, Cc1cc(COc2ccc(N)cc2)c2ccccc2n1 to produce Cc1cc(COc2ccc(NC(=O)CC3NC(=O)NC3=O)cc2)c2ccccc2n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.