def set_aromatic(self):
        """set the cycle to be an aromatic ring"""
        #XXX FIX ME
        # this probably shouldn't be here
        for atom in self.atoms:
            atom.aromatic = 1
            
        for bond in self.bonds:
            bond.aromatic = 1
            bond.bondorder = 1.5
            bond.bondtype = 4
            bond.symbol = ":"
            bond.fixed = 1

        self.aromatic = 1