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The involvement of the 2,3-epoxybrassinosteroids secasterone and 2,3-diepisecasterone in the biosynthesis of castasterone has been demonstrated in seedlings of Secale cereale by LC–ESI-MS. Deuterated secasterone, upon administration to rye seedlings, was incorporated into castasterone and its 2β- and 3β-epimers. Administration of deuterated 2,3-diepisecasterone resulted in castasterone and 2-epicastasterone...
Two new brassinosteroids, (22R,23R,24S)-22,23-dihydroxy-24-methyl-5α-cholest-2-en-6-one (secasterol) and (22R,23R,24S)-22,23-dihydroxy-2α,3α-epoxy-24-methyl-5α-cholest-6-one (2,3-diepisecasterone) have been identified together with a known 2,3-epoxybrassinosteroid, secasterone, in seedlings of Secale cereale. Deuterated secasterol, teasterone, and typhasterol, upon administration to rye seedlings,...
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