Using COC(=O)c1cccc(-c2nnc(C3(c4cccs4)CCC3)n2C2CC2)c1 to produce O=C(O)c1cccc(-c2nnc(C3(c4cccs4)CCC3)n2C2CC2)c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.