Using O=C1C(CSC(=O)c2ccccc2)=C(CSC(=O)c2ccccc2)C(=O)C(CSC(=O)c2ccccc2)=C1CSC(=O)c1ccccc1 to produce O=C1c2cscc2C(=O)c2cscc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.