NC(=O)C1(NC(=O)[C@@H]2CC3(CC(c4cccc(NC(=O)c5cc([N+](=O)[O-])cc([N+](=O)[O-])c5)c4)=NO3)CN2C(=O)c2ccccc2)CC1
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?