Using COCCOCCOc1cccc(C2=NC(C)(C(=O)OC)CN2)c1O to produce COCCOCCOc1cccc(C2=NC(C)(C(=O)O)CN2)c1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.