CCOc1ccc(CCN2C(=S)N([C@@H](Cc3ccc(O)cc3)CN3CCC[C@@H]3CN3C(=S)NC[C@@H]3CC(C)C)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?