CCCCCCNC(=O)O[C@@]12CN(S(=O)(=O)c3ccc(C)cc3)C[C@]1(O)Cn1c(=O)n(CCCCCC)c(=O)n1C2
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?