COC(=O)[C@]1(C)CC[C@@]2(C)CC[C@@]3(C)C4=CC=C5C(=CC(=O)C(O)=C5C)[C@@]4(C)CC[C@@]3(C)C2C1
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?