Using O=C(Nc1ncc(C(=O)O)s1)c1cn(Cc2ccc(Cl)c(Cl)c2)nn1, NCCO to produce O=C(Nc1ncc(C(=O)NCCO)s1)c1cn(Cc2ccc(Cl)c(Cl)c2)nn1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.