COC(=O)c1cc(NS(=O)(=O)c2ccc(N3CCOCC3)c([N+](=O)[O-])c2)cc(C(=O)OC)c1
Hydrogen bond acceptor: The atom, ion, or molecule component of a hydrogen bond which does not supply the bridging (shared) hydrogen atom. How many hydrogen bond acceptors does the molecule have?