Using O=C([O-])[O-], CCOC(=O)c1c[nH]c2ccc(C(=O)c3c(C)c(OC)c4ccccn34)cc2c1=O to produce CCOC(=O)c1cn(C)c2ccc(C(=O)c3c(C)c(OC)c4ccccn34)cc2c1=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.