Using O=C([O-])Cc1nc2ccccc2s1, CC(=O)OCC(=O)c1ccccc1 to produce O=C1OCC(c2ccccc2)=C1c1nc2ccccc2s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.