Using COCc1nc(C)c(-c2cc(C(=O)OC)c(C)cc2C)[nH]1 to produce COCc1nc(C)c(-c2cc(C(=O)O)c(C)cc2C)[nH]1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.