Using O=C(O)CC(=O)O, Cc1c(-c2ccccc2)oc2c(C=O)cccc2c1=O to produce Cc1c(-c2ccccc2)oc2c(/C=C/C(=O)O)cccc2c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.