COc1cc([N+](=O)[O-])ccc1N1C(=O)C2c3[nH]c4ccccc4c3C3CCC(C(C)(C)C)CC3C2C1=O
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?