COC(=O)c1cc(NS(=O)(=O)c2ccc(Cl)c(N3C(=O)c4ccc(C(=O)O)cc4C3=O)c2)cc(C(=O)OC)c1
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?