COc1ccc(C2=CC(C(C)=C(C(N)=O)C(N)=O)C=C(c3ccc(Br)cc3)C2)c(OC)c1
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?