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[²H₆]ABA has been most commonly employed as the internal standard in mass spectrometric quantification of ABA. This internal standard, synthesized by base exchange, works well for analytical procedures in which base exchange is minimal. Efforts have been made to develop an ABA deuterated at C-6 of the side chain and a ¹³C labelled ABA, to provide an internal standard that would be more stable. Deuterated ABA analogues have also been employed in plant metabolism studies to assess the relative roles of ABA and its catabolites in biological processes affected by ABA.

LABELLED ABSCISIC ACID

[²H₆](+)-cis,trans-ABSCISIC ACID (2H-ABA) [(S)-5-[²H₆](1-hydroxy-2,6,6-trimethyl-4-oxocyclohex-2-en-1-yl)-3-methyl-(2Z,4E)-pentadienoic acid]

MW 270.36; crystalline; purity > 98% (HPLC)
CAS: 35671-08-0; C₁₅H₁₄²H₆O₄

	034 2721	1	mg
	034 2722	2	mg
	034 2723	5	mg

[²H₆](+)-cis,trans-ABSCISIC ACID METHYL ESTER (2H-ABAMe) [(S)-5-[²H₆](1-hydroxy-2,6,6-trimethyl-4-oxocyclohex-2-en-1-yl)-3-methyl-(2Z,4E)-pentadienoic acid methylester]

MW 284.38; crystalline; purity > 98% (HPLC)
CAS: 35671-08-0; C₁₆H₁₆²H₆O₄

	034 2761	1	mg
	034 2762	2	mg
	034 2763	5	mg