CCC1=C2CC[C@H]3C(=O)N(C)C(=O)[C@H]3[C@H]2[C@@]2(Cc3ccccc3)/C(=N/CC3CC3)OC(=O)N2C1=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?