From the seed of Erysimum Perofskianum, Fisch. et Mey. (family Cruciferae) W. Schneider and H. Kaufmann2) obtained a sulphone mustard oil, C6H1102Ns2, named erysolin. It is a homologue of cheirolin, C5H902Ns2 found in wallflower seeds (Ger. Goldlack.)

The yield of the fresh seed, not deprived of its fat, was 0,05 p. c. at best. Recrystallized from ether, erysolin is obtained in beautiful, colorless prisms (m. p. 59 to 60°) which irritate the mucous membrane. With alcoholic ammonia it yields a thiourea melting at 143 to 144°. Saponification with hydrochloric acid yielded the corresponding base. Upon oxidation with nitric acid this yielded d-aminobutyl methyl sulphone. Hence erysolin is d-thiocarbimidobutylmethyl sulphone: Ch3s02 (Ch2)4NCS. The correctness of this formula was established by synthesis.