def groupList(grpName):
    """
    returns a list of resNames corresponding to grpName
    """
    grpList = {
               'ASP': ["ASP"],
               'GLU': ["GLU"],
               'C- ': ["C- "],
               'CYS': ["CYS"],
               'TYR': ["TYR"],
               'HIS': ["HIS"],
               'LYS': ["LYS"],
               'ARG': ["ARG"],
               'COO': ["ASP", "GLU", "C- "],
              }

    return grpList[grpName]