Using O=C(O)c1cc(-n2c(-c3ccccc3)cc3c2CCc2ccccc2-3)ccc1O to produce O=C(O)c1cc(-n2c(-c3ccccc3)cc3c4ccccc4ccc32)ccc1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.