Using O=C(O)c1cc2ccccc2cn1, COCCc1nc2c(N)nc3ccccc3c2n1CCCCN to produce COCCc1nc2c(N)nc3ccccc3c2n1CCCCNC(=O)c1cc2ccccc2cn1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.