COc1ccc2[nH]c3c(c2c1)CCN1C(=O)C(CC(=O)NCCc2ccccn2)C[C@H](C(=O)N(C(C)C)C(C)C)[C@@]31C
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?