OC1(C(Sc2cc(C(F)(F)F)cc(C(F)(F)F)c2)Sc2cc(C(F)(F)F)cc(C(F)(F)F)c2)C=CCCC1
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?