Root material of Capparis grandis, of Indian origin, contains a free isothiocyanate, identified as 4,5,6,7-tetrahydroxydecyl isothiocyanate 1 by spectroscopical and chemical means, yet without specification as to its stereochemistry. The presence of the parent glucosinolate, and three other, unidentified glucosinolates in C. grandis has been noted. The distribution of glucosinolates within the genus Capparis is reviewed and the biosynthetic origin of the individual compounds discussed.