CCOc1ccc(CCN2C(=S)N([C@@H](CC(C)C)CN3CCC[C@@H]3CN3C(=S)NC[C@@H]3Cc3ccccc3)C[C@@H]2Cc2ccc(O)cc2)cc1
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?