Using CCOC(=O)CC1Cc2ccc(C(=O)NCCNc3ccccn3)cc2Cc2ccccc21 to produce O=C(O)CC1Cc2ccc(C(=O)NCCNc3ccccn3)cc2Cc2ccccc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.