396. 2,2'-Disulfandiylbis(pyridin-1-oxid)^● (additiv s trihydrátem síranu hořečnatého) (pyrithiondisulfid + síran hořečnatý);
Dithio-2,2'-bispyridine-dioxidel,1' (additive with trihydrated magnesium sulphate) (pyrithione disulphide + magnesium sulphate)°