Using CCCCCCn1c(C)c(CC(N)=O)c2cc(OCCCC(=O)OCC)ccc21 to produce CCCCCCn1c(C)c(CC(N)=O)c2cc(OCCCC(=O)O)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.