COc1cc2cc(C(=O)N3CC(CCl)c4c3cc(NC(=O)C(C)(C)c3ccccc3[N+](=O)[O-])c3ccccc43)[nH]c2c(OC)c1OC
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?