CCCCCCNC(=O)O[C@H]1Cn2c(=O)ccc(=O)n2[C@@H]2CN(S(=O)(=O)c3ccc(C)cc3)C[C@]12O
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?