Cc1cc(Cl)c2c(c1)C1(NC(CC(N)=O)[C@H]3C(=O)N(c4sc5c(c4C#N)CCCC5)C(=O)[C@H]31)C(=O)N2
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?