Using Nc1nc(N)c2c(CNc3ccc4ccccc4c3)coc2n1, C=O to produce CN(Cc1coc2nc(N)nc(N)c12)c1ccc2ccccc2c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.