CCn1cc(C2C3=C(CC(C)(C)CC3=O)N(c3ccc(C)cc3)C3=C2C(=O)CC(C)(C)C3)c(C)n1
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?