Examples of common protective groups include but are not limited to acetamidomethyl (Acm), acetyl (Ac), adamantyloxy (AdaO), benzoyl (Bz), benzyl (Bzl), 2-bromobenzyl, benzyloxy (BzlO), benzyloxycarbonyl (Z), benzyloxymethyl (Bom), 2-bromobenzyloxycarbonyl (2-BrZ), tert-butoxy (tBuO), tert-butoxycarbonyl (Boc), tert-butoxymethyl (Bum), tert-butyl (tBu), tert-buthylthio (tButhio), 2-chlorobenzyloxycarbonyl (2-ClZ), cyclohexyloxy (cHxO), 2,6-dichlorobenzyl (2,6-DiCl-Bzl), 4,4-dimethoxybenzhydryl (Mbh), 1-(4,4-dimethyl-2,6-dioxo-cyclohexylidene)3-methyl-butyl (ivDde), 4-{N-[1-(4,4-dimethyl-2,6-dioxo-cyclohexylidene)3-methylbutyl]-amino) benzyloxy (ODmab), 2,4-dinitrophenyl (Dnp), fluorenylmethoxycarbonyl (Fmoc), formyl (For), mesitylene-2-sulfonyl (Mts), 4-methoxybenzyl (MeOBzl), 4-methoxy-2,3,6-trimethyl-benzenesulfonyl (Mtr), 4-methoxytrityl (Mmt), 4-methylbenzyl (MeBzl), 4-methyltrityl (Mtt), 3-nitro-2-pyridinesulfenyl (Npys), 2,2,4,6,7-pentamethyldihydrobenzofurane-5-sulfonyl (Pbf), 2,2,5,7,8-pentamethyl-chromane-6-sulfonyl (Pmc), tosyl (Tos), trifluoroacetyl (Tfa), trimethylacetamidomethyl (Tacm), trityl (Trt) and xanthyl (Xan)

McGraw-Hill Professional, 2008
Administration Methods and Related Considerations Glutathione can be administered in various forms, each with its own absorption rates and effects on the body
It is possible that the protective effects of vitamin D are not produced through scavenging of free radicals or induction of antioxidant enzymes and are instead due to interactions with the vitamin D receptor
Therefore, SQORs influence on ferroptosis in cancer depends on tumor metabolic demands and the immune microenvironment: it may help tumor cells survive by preventing ferroptosis, or alternatively enhance anti-tumor immunity by permitting some oxidative damage
Alternatively, a pulmonary embolus could be asymptomatic