Nc1ccc(Oc2ccc(C3(c4ccc(Oc5ccc(N)c(O)c5)cc4)C4CC5C6CC7CC5C3C(C7)C6C4)cc2)cc1O
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?