Cc1ccc(S(=O)(=O)N/N=C(/CC(=O)c2c(C)[n+]([O-])c3ccccc3[n+]2[O-])C(=O)Nc2ccc(C)c(C)c2)cc1
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?