O=C(Nc1ncnc2c1ncn2[C@@H]1O[C@H](/C=C/C(=O)N2CCN(c3ccc(F)cc3)CC2)[C@@H](O)[C@H]1O)c1ccccc1
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?