Using O=C1CSC(=O)N1, CC(C)(C)OC(=O)NCCc1cccc(-c2ccc(C=O)s2)c1 to produce CC(C)(C)OC(=O)NCCc1cccc(-c2ccc(C=C3SC(=O)NC3=O)s2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.