COc1ccc(N2C(=O)C3c4[nH]c5ccc([N+](=O)[O-])cc5c4C4CCC(C(C)(C)C)CC4C3C2=O)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?