Using COC(=O)c1c(O)cccc1O, CC(C)(C)OC(=O)NCCCCO to produce COC(=O)c1c(O)cccc1OCCCCNC(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.