CC(=O)O[C@H]1CC[C@H]2[C@@H]3CC[C@H]4Nc5c(cnn5S(C)(=O)=O)C[C@]4(C)[C@H]3CC[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?