CC(=O)Oc1c2c(c3c(c1CC=C(C)C)O[C@@]14C(=CC5CC1C(C)(C)OC4(C/C=C(\C)C(=O)O)C5=O)C3=O)OC(C)(CCC=C(C)C)C=C2
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?