Using O=CO, COc1ccc2c(c1)CNN=C2Cc1c(Cl)cncc1Cl to produce COc1ccc2c(c1)CN(C=O)N=C2Cc1c(Cl)cncc1Cl, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.