COc1ccc(-c2oc(=O)c3cc(OC)c(OC)cc3c2C#C[C@]2(O)CC[C@H]3[C@@H]4CCc5cc(OC)ccc5[C@H]4CC[C@@]32C)cc1
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?