O=C(O)C(F)(F)F.O=C1C2=C(C3=NCCc4c[nH]c1c43)C1(C=C(Br)C(O)C(Br)=C1)CCN2
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?