. . . . "L, M, Q and Rh are independently H, F, Cl, Br, I, CH3, OCH3, NO2, CF3, CN, N(CH3)2, NH2, SCH3 or SO2 CH3 provided that only one of M or Q may be a substituent other than H, F, Cl, Br, I, CH3 or OCH3." .