Using Cc1ccc(-c2nc3sc4ccccc4n3c2CC(=O)N(C)C)s1, COCCO to produce Cc1ccc(-c2nc3sc4ccccc4n3c2CC(=O)O)s1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.