Using O=C([O-])[O-], COc1ccc(-c2n[nH]c3c2Cc2sc(-c4ccc(N)nc4)cc2-3)cc1 to produce COc1ccc(-c2n[nH]c3c2C(=O)c2sc(-c4ccc(N)nc4)cc2-3)cc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.