Using COC(=O)CCCCCCCCCCCCCCCC(c1nnn[nH]1)c1nnn[nH]1 to produce O=C(O)CCCCCCCCCCCCCCCC(c1nnn[nH]1)c1nnn[nH]1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.