CC1=C(C(=O)Nc2ccccc2)C(c2ccc(C3C(C(=O)Nc4ccccc4)=C(C)NC(C)=C3C(=O)Nc3ccccc3)cc2)C(C(=O)Nc2ccccc2)=C(C)N1
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?