CCN1CCN(Cc2ccc(NC(=O)c3cc(NC(=O)c4cncc(-c5ccc(C#N)cc5)c4)cc(OC)c3)cc2C(F)(F)F)CC1.O=C(O)C(F)(F)F
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?