O=C1N[C@@H](Cc2ccccc2)C(=O)N2[C@H]1C[C@]1(Br)c3ccccc3N(S(=O)(=O)c3ccccc3)[C@H]21
Hydrogen bond acceptor: The atom, ion, or molecule component of a hydrogen bond which does not supply the bridging (shared) hydrogen atom. How many hydrogen bond acceptors does the molecule have?