CC1(C)CC(=O)c2c(nc(SSc3nc4c(c(-c5ccccc5)c3C#N)C(=O)CC(C)(C)C4)c(C#N)c2-c2ccccc2)C1
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?