CSC[C@H](NC(=O)Cc1c(C)c2cc3c(C)c(C)oc3cc2oc1=O)C(=O)N[C@@H](Cc1ccccc1)C(=O)O
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?