COc1cc(NC(=O)CSc2nc(C)c(C(=O)Nc3ccccc3)c(-c3ccc(OC)c(OC)c3)c2C#N)c(OC)cc1Cl
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?