Using CCOC(=O)C(Cc1ccc(C)c(C)c1)NC(=O)N1CCC(N2Cc3ccccc3NC2=O)CC1 to produce Cc1ccc(CC(NC(=O)N2CCC(N3Cc4ccccc4NC3=O)CC2)C(=O)O)cc1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.