Patent ID: 8614228

Claim:
A quinone prodrug composition comprising a quinone compound of formula I wherein R 1 is H or C 1 -C 4 alkyl, optionally substituted with a sulfyl (—SH or thio alkyl) group; R 4 is C 1 -C 4 alkyl, aryl or heteroaryl, wherein said aryl or heteroaryl is selected from the group consisting of phenyl, pyridyl, imidazole and thiazole, and is optionally substituted with one or more independently selected C 1 -C 3 alkyl groups; the pro-moiety is selected from —(C 1 -C 11 )alkyl, —(C 0 -C 6 )alkyl-aryl, —(C 0 -C 6 )alkyl-heteroaryl, —(C 0 -C 6 )alkyl-aryl-heteroaryl, —(C 0 -C 6 )alkyl-COOH, —(C 1 -C 6 )alkyl-OH, 1-pyridyl, 2-pyridyl, 3-pyridyl, 4-pyridyl, aryl-heteroaryl, and n is 0, 1, 2 or 3, with the proviso that when n is 0, R 1 is not present.