Using CCn1c(-c2nonc2N)nc2cncc(CN3CCC4(CC3)OCCO4)c21 to produce CCn1c(-c2nonc2N)nc2cncc(CN3CCC(=O)CC3)c21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.