Using COC(=O)c1c(-c2ccccc2)cnnc1-c1ccccc1, CO to produce Cc1nnc(-c2ccccc2)c(C(=O)O)c1-c1ccccc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.