Based on the SMILES O=C1NC(=O)C(c2ccccc2)(c2ccccc2)N1, the molecule is not a hERG blocker.
Based on the {SMILES__description} {#representation |!}{SMILES#}, the molecule is {herg_blocker#not &NULL}a {herg_blocker__names__noun}.
5,5-diphenylimidazolidine-2,4-dione