COC(=O)C1=C(C(=O)OC)N(c2ccc(OC)cc2[N+](=O)[O-])C(c2ccc(C)cc2)=CC1c1ccc(OC)cc1OC
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?