CC1CC[C@@]2(C(=O)O)CCC3(C)C(=CCC4[C@]5(C)CC(O)C(O)[C@](C)(CO)C5C(O)C[C@@]43C)C2C1C
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?