CC1(C)CC[C@]2(C(=O)O)C(O)C[C@@]3(C)C(=CCC4[C@]3(C)CCC3C(C)(C)C(O)CC[C@@]34C)C2C1
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?