C[C@@]12CCC(=O)C=C1CC[C@H]1[C@H]2[C@@H](O)C[C@@]2(C)[C@@H](c3csc(-c4ccccc4)n3)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?