CCN(CC)C(=O)[C@H]1C[C@H](CC(=O)NCCCOC)C(=O)N2CCc3c([nH]c4cc(CCC(=O)N(C)C)ccc34)[C@]12C
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?