CCN1C(=O)C2(C(C(=O)c3cc4ccccc4o3)=C(O)C(=O)N2CCCN(C)C)c2ccccc21
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?