Using CCCCOC(=O)CC1CCN(c2nc(Nc3ccc4c(c3)CCC(=O)N4)nc3[nH]ccc23)CC1 to produce O=C(O)CC1CCN(c2nc(Nc3ccc4c(c3)CCC(=O)N4)nc3[nH]ccc23)CC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.