Cc1ccc(S(=O)(=O)N[C@H]2COC(=O)[C@@H](Cc3ccccc3)NC(=O)[C@@H](C)COC(=O)C/C=C\[C@@H]2C)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?