Using OCc1ccc2c(c1)ncn2-c1cccc(COCc2ccccn2)c1 to produce O=Cc1ccc2c(c1)ncn2-c1cccc(COCc2ccccn2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.