Using COC(=O)CCn1c(=O)n(Cc2cccc3cc(C)n(C)c23)c2ccccc21 to produce Cc1cc2cccc(Cn3c(=O)n(CCC(=O)O)c4ccccc43)c2n1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.