COc1cc(-c2nn(C3CCC(N4CCN(C(C)=O)CC4)CC3)c3ncnc(N)c23)ccc1NC(=O)c1cc2ccccc2n1C
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?