Source:http://linkedlifedata.com/resource/umls/id/C0017054
MSH: A natural tocopherol with less antioxidant activity than ALPHA-TOCOPHEROL. It exhibits antioxidant activity by virtue of the phenolic hydrogen on the 2H-1-benzopyran-6-ol nucleus. As in BETA-TOCOPHEROL, it also has three methyl groups on the 6-chromanol nucleus but at different sites.,NCI: Tocopherol with two methyl groups on the same side (R2 and R3 position) of its chromanol ring.