Cc1[nH]c2c(C)cccc2c1CCNC(=O)c1ccc2c(c1[N+](=O)[O-])C(=O)c1ccccc1C2=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?