CCN(CC)c1ncnc2c1ncn2[C@@H]1O[C@@H](COP(=O)([O-])OP(=O)([O-])C(Br)(Br)P(=O)([O-])O)[C@H](O)[C@@H]1O.[Na+].[Na+].[Na+]
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?