Using CN1CCC(=C2c3ccccc3C=C(N3CCCCC3)c3ccccc32)CC1, CO to produce CN1CCC(=C2c3ccccc3CC(=O)c3ccccc32)CC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.