Using O=C1C=CC(=O)O1, CC(C)(C)OC(=O)NCC(CC(=O)O)S(=O)(=O)O to produce O=C(O)/C=C\C(=O)NCC(CC(=O)O)S(=O)(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.