Cl.O[C@@]12Cc3c([nH]c4ccccc34)[C@@H]3Oc4c(-c5ccccc5)ccc5c4[C@@]31CCN(CC1CC1)[C@@H]2C5
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?