C[C@@H](CO)N1C[C@@H](C)[C@H](CN(C)S(C)(=O)=O)Oc2ccc(NS(=O)(=O)c3ccccc3)cc2CC1=O
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?