O=C(O)/C=C/c1ccc(S(=O)(=O)N2CCN(CCN3C(=O)C4C5C=CC(C5)C4C3=O)CC2)cc1
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?