O=C(/C=C/c1cccc([N+](=O)[O-])c1)N1CCN(CCOC(c2ccccc2)c2ccccc2)CC1.O=C(O)/C=C\C(=O)O
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?