CN(C(=O)C12C3(C(=O)C(C)(C)C)C4C5(C#N)C3C1(C(=O)C(C)(C)C)C5C42C(=O)C(C)(C)C)C(C)(C)C
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?