CSc1nc(NC2OCC(OC(C)=O)C(OC(C)=O)C2OC(C)=O)c(/N=C\C=N\c2c(NC3OCC(OC(C)=O)C(OC(C)=O)C3OC(C)=O)nc(SC)[nH]c2=O)c(=O)[nH]1
Hydrogen bond acceptor is the chemical compound which contains the lone electron pairs that participate in the hydrogen bond formation. This compound should contain a more electronegative atom (more electronegative than hydrogen) with lone electron pairs. Then it can attract protons from a donor. Moreover, the electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?