A compound for use in a method of treating or suppressing a mitochondrial disorder, wherein the mitochondrial disorder is selected from the group consisting of an inherited mitochondrial disease; Myoclonic Epilepsy with Ragged Red Fibers (MERRF); Mitochondrial Myopathy, Encephalopathy, Lactacidosis, Stroke (MELAS); Leber's Hereditary Optic Neuropathy (LHON); Leigh Disease; Kearns-Sayre Syndrome; Friedreich's Ataxia; cardiomyopathy; encephalomyopathy; other myopathy, renal tubular acidosis; a neurodegenerative disease; Parkinson's disease; Alzheimer's disease; amyotrophic lateral sclerosis; a motor neuron disease; a neurological disease; epilepsy; a genetic disease; Huntington's Disease; a mood disorder; schizophrenia; bipolar disorder; an age-associated disease; macular degeneration; diabetes; and cancer, and wherein the compound is of the formula: or or any stereoisomer, mixture of stereoisomers, salt, hydrate, or solvate thereof; where n is an integer from 0 to 9 inclusive, and each unit can be the same or different; wherein the bonds indicated with dashed lines can be single or double; where R 1, R 2, and R 3 are independently selected from the group consisting of -H and -C 1 -C 5 alkyl; where R 4 is selected from the group consisting of -H, -O-R 5, -S-R 5, -F, -Cl, -Br, -I, and -NR 5 R 6; where R 5 and R 6 are independently selected from the group consisting of -H, -C 1 -C 5 alkyl, -C 3 -C 6 cycloalkyl, -C 1 -C 5 haloalkyl, aryl, heteroaryl, -(C=O)-C 0 -C 8 alkyl, and -(C=O)-C 0 -C 8 alkyl-C 6 -C 10 aryl-C 0 -C 8 alkyl, or where R 5 and R 6 selected from these groups are combined to form a ring; where X is selected from the group consisting of -H, -NR 7 R 8, -OR 9 and -(CH 2) 2 C(CH 3) 2 OH; where R 7 and R 8 are independently selected from the group consisting of -H, -C 1 -C 8 alkyl, -C 1 -C 8 haloalkyl, and -(C=O)-C 1 -C 8 alkyl, or where either one of R 7 and R 8 is independently selected from the group consisting of -(C=O)-C 1 -C 8 haloalkyl, -(C=O)-NH 2, -(C=O)-NHC 1 -C 8 alkyl, -(C=O)-NHC 1 -C 8 haloalkyl, -(C=O)-NR 20 R 21 where R 20 is -(CH 2) p -, R 21 is -(CH 2) q -, p and q are independently integers between 0 and 7 inclusive, p + q is between 2 and 7 inclusive, R 20 and R 21 together with the nitrogen atom to which they are attached combine to form a 3- to 8-membered ring, and where another group selected from -NH-, -N(C 1 -C 4 alkyl)-, -O-, or -S- can be optionally incorporated in the ring formed by R 20 and R 21 and the nitrogen atom to which they are attached, -(C=O)-OC 1 -C 8 alkyl, -(C=O)-OC 1 -C 8 haloalkyl, -S 2 C 1 -C 8 alkyl, -S 2 aryl, and -S 2 aralkyl, and where the other of R 7 or R 8 is -H, -C 1 -C 8 alkyl or -C 1 -C 8 haloalkyl or where R 7 and R 8 selected from these groups are combined to form a ring, or where R 7 is -(CH 2) p -, R 8 is -(CH 2) q -, p and q are independently integers between 0 and 7 inclusive, p + q is between 2 and 7 inclusive, R 7 and R 8 together with the nitrogen atom to which they are attached combine to form a 3- to 8-membered ring, and where another group selected from -NH-, -N(C 1 -C 4 alkyl)-, -O-, or -S- can be optionally incorporated in the ring formed by R 7 and R 8 and the nitrogen atom to which they are attached; where R 9 is independently selected from the group consisting of -H, -C 1 -C 8 alkyl, -C 1 -C 8 haloalkyl, -(C=O)-C 1 -C 8 alkyl, -(C=O)-C 1 -C 8 haloalkyl, -(C=O)-NH 2, -(C=O)-NHC 1 -C 8 alkyl, -(C=O)-NHC 1 -C 8 haloalkyl, -(C=O)-NR 20 R 21 where R 20 is -(CH 2) p -, R 21 is -(CH 2) q -, p and q are independently integers between 0 and 7 inclusive, p + q is between 2 and 7 inclusive, R 20 and R 21 together with the nitrogen atom to which they are attached combine to form a 3- to 8-membered ring, and where another group selected from -NH-, -N(C 1 -C 4 alkyl)-, -O-, or -S- can be optionally incorporated in the ring formed by R 20 and R 21 and the nitrogen atom to which they are attached, -(C=O)-OC 1 -C 8 alkyl, -(C=O)-OC 1 -C 8 haloalkyl, -S 2 C 1 -C 8 alkyl, -S 2 aryl, and -S 2; with the provisos that when n = 3 and if R 4 is -H or -OH, then X is not -H, where alkyl refers to a straight-chain, branched-chain or cyclic saturated aliphatic group, and combinations thereof, having the number of carbon atoms specified.