CC(C)=C1C(=O)C(c2ccccc2)=C2CN3C(=O)N(CCc4ccccc4)C(=O)[C@]3(Cc3ccc(C(F)(F)F)cc3)[C@H]21
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?