O=C(O)[C@@H]1[C@@H]2C[C@H]([C@@H](Br)[C@H]2N2C(=O)CCC2=O)[C@@H]1C(=O)O
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?