Abstract: Sulfated tannins or salts thereof are herein disclosed. These compounds can be prepared by a method which comprises reacting tannin with a sulfonating agent under a basic condition. These compounds show antiviral activity and reverse transcriptase inhibitor, effects and can be used to treat patients infected with a variety of virus such as AIDS virus, herpesvirus, influenza virus or rhinovirus.

Abstract: A convertible car body structure which includes a pair of side structures, a front windshield structure and a rear structure, the body structure having a top opening and a back window opening. A roof panel and a back window panel are provided for covering the top opening and the back window opening of the car body structure, respectively. The roof panel is connected at the rear end portion swingably with the front end portion of the back window panel so that the roof panel can be folded on the back window panel. The back window panel is connected at the rear end portion swingably with the rear body structure. The rear body structure is formed with a concave space for receiving the roof panel and the back window panel after the roof panel has been folded on the back window panel. A concealing cover panel is provided on the rear body structure for covering the concave space.