Using CC(=O)N1CCc2ccc(NC(=O)c3c[nH]c4ccccc4c3=O)cc21 to produce O=C(Nc1ccc2c(c1)NCC2)c1c[nH]c2ccccc2c1=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.