CC(=O)N[C@H]1[C@H](Oc2ccc3c(c2)CCC2C3CC[C@]3(C)C(=O)CCC23)O[C@H](CO)[C@@H](O)[C@@H]1O
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?