Using CCCn1c(=S)[nH]c(=O)c2[nH]c(C3CC3)nc21, S=P12SP3(=S)SP(=S)(S1)SP(=S)(S2)S3 to produce CCCn1c(=S)[nH]c(=S)c2[nH]c(C3CC3)nc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.