O=C1C[C@@H](O)[C@@H](O)[C@@H]2[C@@H]1CC[C@H]1C(=O)N(Cc3ccc4c(c3)OCO4)C(=O)[C@H]12
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?