Using O=C(O)CN1C[C@@H]2COCCN2c2nc(Cl)ncc21, COCCN to produce COCCNC(=O)CN1C[C@@H]2COCCN2c2nc(Cl)ncc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.