Using COC1=C(c2c(C)cc(C)cc2C)C(=O)C(Cc2cc(C)on2)C1 to produce Cc1cc(C)c(C2C(=O)CC(Cc3cc(C)on3)C2=O)c(C)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.