COc1c(C(=O)CC2c3c(cc4oc(C)cc(=O)c4c3OC)OC(=N)C2c2nc3ccccc3[nH]2)c(O)c(OC)c2occc12
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?