Using CSc1nc(-c2ccncc2)c(-c2ccc3ccccc3c2)c(=O)n1C, CO to produce Cn1c(O)nc(-c2ccncc2)c(-c2ccc3ccccc3c2)c1=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.