C[C@H]1CN([C@@H](C)CO)C(=O)c2cccc(NC(=O)c3nc4ccccc4s3)c2O[C@H]1CN(C)C(=O)Nc1ccc(F)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?