Using COC(=O)Cc1cccc(Cc2nc3c(F)c(F)cc(F)c3s2)c1 to produce O=C(O)Cc1cccc(Cc2nc3c(F)c(F)cc(F)c3s2)c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.