Using COC(=O)/C=C/c1ccn2c(-c3ccccc3)c(-c3ccc(C4(NC(=O)OC(C)(C)C)CCC4)cc3)nc2c1 to produce COC(=O)CCc1ccn2c(-c3ccccc3)c(-c3ccc(C4(NC(=O)OC(C)(C)C)CCC4)cc3)nc2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.