C[C@H]1CN([C@H](C)CO)C(=O)c2cc(-c3cccc(C(=O)N(C)C)c3)cnc2O[C@H]1CN(C)S(=O)(=O)c1cccc(F)c1
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?