CC(=O)OCC1OC(n2c(=S)n(-c3ccc(C)cc3)c(=O)c3ccccc32)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?