Cc1ccc(C(=O)[C@@H]2[C@H]3[C@H]4CO[C@H](O4)C(=O)[C@H]3[C@@H]3C=Cc4ccccc4N23)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?