Using Ic1cccs1, CCCC[Sn](CCCC)(CCCC)c1scc(P(=O)(OCC)OCC)c1P(=O)(OCC)OCC to produce CCOP(=O)(OCC)c1csc(-c2cccs2)c1P(=O)(OCC)OCC, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.