CC(=O)OC1CC[C@]2(C)C(CC[C@@]3(C)C2C(=O)C=C2C4C(C)C(C)CC[C@@]4(C(=O)O)CCC23C)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?