CC(C)(C)OC(=O)NCc1ccc(CNC(=O)c2[nH]cnc2C(=O)N[C@@H](Cc2ccccc2)C(=O)OC(C)(C)C)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?