COC(=O)CCC(=O)OC1(C)C(=O)C2=CN(Cc3ccc(OC)cc3)C(c3ccc(OC)cc3)=CC2=C(Br)C1=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?