CC1CC2=C(S(=O)(=O)c3ccccc3)CC(S(=O)(=O)c3ccccc3)(S(=O)(=O)c3ccccc3)CC21
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?