Nc1ncnc2c1ncn2[C@@H]1O[C@H](CNC(=O)[C@@H]2CCCN2S(=O)(=O)c2ccc(F)cc2)[C@@H](O)[C@H]1O
Hydrogen bond acceptor is the chemical compound which contains the lone electron pairs that participate in the hydrogen bond formation. How many hydrogen bond acceptors does the molecule contain?