Using O=Cc1cccnc1, COCc1nc2c(N)nc3ccccc3c2n1CCCCN to produce COCc1nc2c(N)nc3ccccc3c2n1CCCCNCc1cccnc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.