2-DEOXYBRASSINOLIDE, A BRASSINOSTEROID FROM PISUM-SATIVUM SEED

GC-MS analysis of fully grown seed of Pisum sativun revealed the occur rence of a new brassinosteroid, 2-deoxybrassinolide, (22R, 23R, 24S)-3 alpha, 22,23-trihydroxy-24-methyl-B-homo-7-oxa-5 alpha-cholestan-6-on e, together with known brassinosteroids, brassinolide, castasterone, t yphasterol and 6-deoxocastasterone. In addition, the presence of a bra ssinolide with an extra hydroxyl group and an epimer of 6-deoxocastast erone was indicated although their structures could not be clarified.