O=C(NC12C3C4C5C1C2C(Br)(C43)C51OCCO1)NC12C3C4C5C1C2C(Br)(C43)C51OCCO1
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?