Using Cn1c(-c2cncc(-c3cnc4c(c3)CCCN4)c2)cc2ccccc21, O=C=NC(=O)c1ccccc1 to produce Cn1c(-c2cncc(-c3cnc4c(c3)CCCN4C(N)=O)c2)cc2ccccc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.