CCOC1=C2CN(S(=O)(=O)c3ccc(C)cc3)[C@@H](c3ccccc3)C[C@H]2[C@H]2C(=O)N(c3ccccc3)C(=O)[C@H]2C1
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?