COc1ccc(CNC(=O)C[C@H]2C[C@H](C(=O)N3CCCCC3)[C@@]3(CCc4ccccc4)c4[nH]c5ccc(Cl)cc5c4CCN3C2=O)cc1OC
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?