Cc1c(O)c(O)cc2c1CC=C1[C@@]2(C)CC[C@@]2(C)C3C[C@](C)(C(=O)O)CC[C@@]3(C)CC[C@@]12C
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?