Using CCCC(CC(=O)OCC)n1ccc2cc(NC(=O)Cc3ccc4c(n3)NCCC4)ccc21 to produce CCCC(CC(=O)O)n1ccc2cc(NC(=O)Cc3ccc4c(n3)NCCC4)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.