Using CCOC(=O)c1nc2ccccc2n(-c2ccc3c(c2)OCCO3)c1=O to produce O=C(O)c1nc2ccccc2n(-c2ccc3c(c2)OCCO3)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.