C=C1C(C)C2C(Cc3ccccc3)NC(=O)C23C(OC(C)=O)/C=C/C(C)(O)C(=O)C(C)C/C=C/C3C1O
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?