CN(C)CCCNC(=O)C[C@H]1C[C@H](C(=O)N2CCCCC2)[C@@]2(C)c3[nH]c4cc(CCC(=O)N(C)C)ccc4c3CCN2C1=O
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?