COc1ccc2[nH]c3c(C)c4ccnc(NCCCN(C)CCCNc5ccc([N+](=O)[O-])c6[nH]c7ccccc7c(=O)c56)c4c(C)c3c2c1.CS(=O)(=O)O
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?