Cc1ccc(S(=O)(=O)N2C[C@H]3N(C(=O)OC(C)C)N(C(=O)OC(C)C)C[C@H](OC(=O)NC4CCCC4)[C@@]3(O)C2)cc1
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?