N-(3,4-dihydro-6-hydroxy--2,5,7,8-tetramethyl-2H-1-benzopyran-2-carbonyl)-N'-(1,2-dithiolane-3-pentanoyl)-1,2-phenylenediamine
n-(3,4-dihydro-6-hydroxy--2,5,7,8-tetramethyl-2h-1-benzopyran-2-carbonyl)-n'-(1,2-dithiolane-3-pentanoyl)-1,2-phenylenediamine