Using O=Cc1ccccc1, COc1cccn2c(=O)c3c(nc12)CCC3 to produce COc1cccn2c(=O)c3c(nc12)C(=Cc1ccccc1)CC3, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.