sing one to eight carbon atoms, haloalkyls comprising one to eight carbon atoms, alkenyls comprising two to eight carbon atoms, and aryls; Q is a halogen atom; 2???x???500, 2???y+z+w???150; 2???y; O???z; O???w???15; 0.3???(y+z+w)/x???3; O???w/(y+z+w)???0.1).