Using CCOC(=O)CN(CCNC(=O)OC(C)(C)C)C(=O)CCn1cc(C)c(=O)[nH]c1=O to produce Cc1cn(CCC(=O)N(CCNC(=O)OC(C)(C)C)CC(=O)O)c(=O)[nH]c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.