NC(=O)C1(NC(=O)[C@@H]2CC3(CC(c4cccc(NC(=O)[C@@H]5CCC(=O)N5)c4)=NO3)CN2C(=O)Cc2ccc(C(F)(F)F)cc2)CC1
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?