CN(C)C(=O)CCc1ccc2c3c([nH]c2c1)[C@]1(C)[C@@H](C(=O)N2CCCCC2)C[C@H](CC(=O)NC(C)(C)C)C(=O)N1CC3
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?