Using O=C1OC(=O)c2ccccc21, Cc1cccc2c1c(CC(=O)O)cn2C to produce Cc1cccc2c1c(/C=C1\OC(=O)c3ccccc31)cn2C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.