CC(=O)O[C@H]1CC[C@@]2(C)C(CC[C@]3(C)C2CC[C@]2(C)Oc4c(C)cc(O)cc4C[C@@H]23)C1(C)C
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?