COc1cc2c(Cc3c4c5c(cc(OC)c(OC)c5c5c(OC)c(OC)ccc35)CCN4C)c3c4c(cc(OC)c(OC)c4c2cc1OC)CCN3C
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?