ClC(Cl)(Cl)C1=N[C@H]2[C@H](Br)[C@@H]3O[C@@H](c4ccccc4)[C@H](c4ccccc4)O[C@@H]3[C@H]2O1
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?