Novel hydroquinone derivatives of the formulae (I) and (II), ##STR1## wherein R.sup.1 is an alkyl group having 7 to 11 carbon atoms, ##STR2## wherein each of R.sup.2 to R.sup.5 is independently a hydrogen atom, a lower alkyl group or a lower alkoxy group provided that at least one of R.sup.2 to R.sup.5 is a lower alkyl group or a lower alkoxy group, and R.sup.6 is an alkyl group having a carbon chain of at least 2 carbon atoms. as compounds having antioxidant activity and tumor incidence inhibiting activity, and an antioxidant and a tumor incidence inhibitor containing, as an active ingredient, a hydroquinone derivative of the formula (III), ##STR3## wherein each of R.sup.7 to R.sup.10 is independently a hydrogen atom, a lower alkyl group or a lower alkoxy group, and R.sup.11 is an alkyl group having a carbon chain of at least 2 carton atoms, and/or a salt thereof.
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Filed: Dec 13, 1995
Date of Patent: Mar 9, 1999
Assignee: Nippon Hypox Laboratories Incorporated
Inventors: Toshio Satoh (Tokushima), Hitoshi Matsumoto (Tokushima), Yasunori Niiro (Tokushima)
Primary Examiner: Laura L. Stockton
Law Firm: Nixon & Vanderhye
Application Number: 8/571,717
International Classification: C07C 43205; A61K 31085;