Using CSc1ccc2c(c1)CCc1cccnc1C2(O)C1CCN(C)CC1 to produce CSc1ccc2c(c1)CCc1cccnc1C2=C1CCN(C)CC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.