C/C1=C\[C@H](C)C[C@H](C)OC(=O)C[C@H](c2ccc(O)cc2)NC(=O)[C@H](Cc2ccc(O)c(I)c2)N(C)C(=O)[C@H](C)NC(=O)[C@@H](C)C1
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?