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is described. Also described is a method of inhibiting the progression of cataract formation in an eye. Methods comprising administering a pharmaceutical composition comprising the above compound to inhibit the formation of a cataract in the eye of a subject and to inhibit progression of cataract fo

is described. Also described is a method of inhibiting the progression of cataract formation in an eye. Methods comprising administering a pharmaceutical composition comprising the above compound to inhibit the formation of a cataract in the eye of a subject and to inhibit progression of cataract formation in the eye of a subject are also described. The above compound also prevents diseases resulting from oxidative stress, including diseases comprising tumor formation resulting from oxidative stress, and also inhibits the progression of diseases resulting from oxidative stress. The above compound may furthermore be used to treat an HIV infection when combined in a pharmaceutical composition with a substance which inhibits HIV replication.

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[ We claim:] [1.]1. A method of preventing in a subject in need therof a disease resulting from oxidative stress wherein oxidative stress causes oxidation of DNA bases and the disease is selected from the group consisting of rheumatoid arthritis, lupus, sickle cell anemia and cancer, which comprises

[ We claim:] [1.]1. A method of preventing in a subject in need therof a disease resulting from oxidative stress wherein oxidative stress causes oxidation of DNA bases and the disease is selected from the group consisting of rheumatoid arthritis, lupus, sickle cell anemia and cancer, which comprises administering to the subject a pharmaceutical composition comprising a pharmaceutically acceptable carrier and an effective oxidative stress-inhibiting amount of a compound having the structure:X and Y are independently carbonyl, C.dbd.S, S.dbd.O, or O.dbd.S.dbd.O; n and p are independently 0 or 1;R.sup.1 and R.sup.2 are independently hydrogen, linear or branched C.sub.1 -C.sub.18 alkyl, alkenyl, or alkynyl, either unsubstituted or substituted with halogen, including F, Cl, Br, and I, C.sub.1 -C.sub.6 alkoxy, (C.dbd.O)R.sup.7, or (C.dbd.O)OR.sup.8 ; wherein R.sup.7 and R.sup.8 are independently C.sub.1 -C.sub.6 linear or branched alkyl;R.sup.3, R.sup.4, and R.sup.5 are independently hydrogen, halogen, including F, Cl, Br, and I, trihalomethyl, C.sub.1 -C.sub.18 linear or branched alkyl, alkenyl, alkynyl, haloalkyl, alkoxy, alkoxyalkyl, alkylthio, or (C.dbd.O)R.sup.9, (C.dbd.O)OR.sup.10, O(C.dbd.O) R.sup.11, (C.dbd.S)R.sup.12, (C.dbd.S) OR.sup.13, O(C.dbd.S)R.sup.14, (S.dbd.O)R.sup.15, (S.dbd.O)OR.sup.16, or (O.dbd.S.dbd.O)OR.sup.17 ; wherein R.sup.19, R.sup.10, R.sup.11, R.sup.12, R.sup.13, R.sup.14, R.sup.15, R.sup.16, and R.sup.17 are independently C.sub.1 -C.sub.18 linear or branched alkyl, alkenyl, or alkynyl; andR.sup.6 is aryl or C.sub.1 -C.sub.18 branched or linear alkyl, alkenyl, or alkynyl, either unsubstituted or substituted with halogen, including F, Cl, Br, and I, C.sub.1 -C.sub.6 alkoxy, (C.dbd.O)R.sup.18, (C.dbd.O)OR.sup.19, or aryl; wherein R.sup.18 and R.sup.19 are independently C.sub.1 -C.sub.6 branched or linear alkyl;wherein when n and p are 0 and R1, R2, R3, R4, and R5 are hydrogen, R6 is not phenylethyl or a pharmaceutically acceptable salt thereof.