Source:http://linkedlifedata.com/resource/umls/id/C0005287
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 GAMMA-TOCOPHEROL, it also has three methyl groups on the 6-chromanol nucleus but at different sites.,NCI: Tocopherol with two methyl groups on opposite sides (R1 and R3 positions) of its chromanol ring.