CCCSc1nc(-c2ccc(OC)cc2)c(C#N)c(=O)n1C1OC(COC(C)=O)C(OC(C)=O)C(OC(C)=O)C1OC(C)=O
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?