CC1(C)C(=O)CC[C@]2(C)C3C(=O)C=C4[C@H]5C[C@@](C)(C(=O)O)CC[C@]5(C)CC[C@]4(C)[C@]3(C)CC[C@@H]12
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?