C[C@H]1CN([C@@H](C)CO)S(=O)(=O)c2ccc(Br)cc2O[C@H]1CN(C)C(=O)Cc1ccccn1
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?