Using O=C(O)C=C1c2ccccc2C=Cc2ccccc21, CC(C)(C)OC(=O)NCCN to produce CC(C)(C)OC(=O)NCCNC(=O)C=C1c2ccccc2C=Cc2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.