CC(C)C[C@@H](CC(=O)N[C@@H](CCC(=O)O)CC(=O)O)NC(=O)[C@@H]1CCCC[C@H]1NC(=O)C[C@@H](NC(=O)C[C@H](Cc1c[nH]c2ccccc12)NC(=O)[C@@H]1CCCC[C@H]1N)C(C)C
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?