CC[C@@H]1CC[C@@H]2[C@H](CC[C@]3(C)[C@@H](OS(=O)(=O)c4ccc(C)cc4)CC[C@@H]23)[C@H]1COS(=O)(=O)c1ccc(C)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?