Cc1ccc([N+](=O)[O-])c2c(NCCNC(=O)c3cc(C(=O)NCCNc4ccnc5c(C)ccc([N+](=O)[O-])c45)n(C)n3)ccnc12.Cl
Hydrogen bond acceptor is the chemical compound which contains the lone electron pairs that participate in the hydrogen bond formation. This compound should contain a more electronegative atom (more electronegative than hydrogen) with lone electron pairs. Then it can attract protons from a donor. Moreover, the electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?