CC[C@@H](C)[C@H](NC(=O)C1CCN(C(=O)[C@@H](NS(=O)(=O)c2ccc(C)cc2)C(C)C)CC1)C(=O)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?