COc1ccc([C@@H]2CC(=O)c3c(O)cc(O[C@@H]4OC(CO[C@@H]5OC(C)[C@H](O)[C@H](O)C5O)[C@@H](O)[C@@H](O)C4O)cc3O2)cc1O
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?