Using COC(=O)C1=CN2C(=NCC2(c2ccc(C)cc2)C(O)C(=O)O)C=C1 to produce COC(=O)C1=CN2C(=NCC2(CC(=O)O)c2ccc(C)cc2)C=C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.