COc1ccc(S(=O)(=O)Nc2cccc3c2O[C@H](CN(C)C(=O)Nc2ccc(C(F)(F)F)cc2)[C@@H](C)CN([C@H](C)CO)C3=O)cc1
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?