Using O=C1c2ccc(OCCN3C(=O)c4ccccc4C3=O)cc2C(=O)c2ccc(OCCN3C(=O)c4ccccc4C3=O)cc21 to produce NCCOc1ccc2c(c1)C(=O)c1ccc(OCCN)cc1C2=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.