The SMILES O=[N+]([O-])c1ccc2c(c1)Nc1nc3ccccc3nc1N2 is not a hERG blocking compound (IC50 < 10uM).
The {#molecule |!}{SMILES__description} {SMILES#} is {herg_inhib#not &NULL}a {herg_inhib__names__noun}.