Using COC(=O)N1Cc2ccc(C(=O)NCc3cccnc3)n2Cc2ccccc21 to produce O=C(NCc1cccnc1)c1ccc2n1Cc1ccccc1NC2, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.