A scroll fluid machine includes an orbiting scroll which has an orbiting end plate. The compounds of Formula I, and the pharmaceutically acceptable salts and prodrugs thereof, are useful in the inhibition of HIV reverse transcriptase, the prophylaxis and treatment of infection by HIV and in the prophylaxis, delay in the onset or progression, and treatment of AIDS. The optical lens is preferably a divergent lens. Because the second seat frame can be conveniently folded to a disabled state adjacent to the backrest frame, erroneous use of the second seat frame can be prevented. The reformate is more easily consumed by an energy conversion device such as a combustion engine, fuel cell, sterling engine or similar device that converts chemical energy into kinetic or electrical energy. The developer regulating member is made of magnetic material and is fixed at both end portions in a longitudinal direction.