The present invention relates to new antioxidative and cytotoxic hydroquinone compounds 10,13,15-heptadecatrienylhydroquinone and 10,13-heptadecadienylhydroquinone that were mainly isolated from an ethanol extract of the sap of Rhus succedanea. A parameter signal, indicating the received signal quality parameter value, is transmitted from a plurality of mobile stations to a base station through a radio link. The base wall extends outward from an inner edge of the inner rim and is integral with the inner rim.