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Antiauxins, which competitively inhibit the actions of auxins, have been discovered through biological studies on synthetic auxins and related compounds. Flavonoids do not affect the tropic responses, but bind to the NPA receptor. Quercetin binds the most strongly with a K_D = 1µM. Morphactins have morphological effects not shared by the phytotropins and may interact with the NPA receptor in a different way. 2,3,5-Triiodobenzoic Acid (TIBA) is unique. It can act as an auxin, anti-auxin and auxin transport inhibitor.

ANTIAUXINS AND AUXIN ANTAGONISTS

AUXINOLE [α-[2-(2,4-Dimethylphenyl)-2-oxoethyl]-1H-indole-3-acetic acid]

MW 321.38; crystalline; purity > 98% (HPLC)
CAS: 86445-22-9; C₂₀H₁₉NO₃

	017 7301	1	mg
	017 7302	2	mg
	017 7303	5	mg

2-(2,4-DICHLOROPHENOXY) PROPIONIC ACID (2,4-DP)

MW 235.07; crystalline; purity > 98% (HPLC)
CAS: 120-36-5; C₉H₈Cl₂O₃

	017 2981	1	g
	017 2982	5	g
	017 2983	25	g

2-(4-CHLOROPHENOXY) ISOBUTYRIC ACID (PCIB)

MW 214.65; crystalline; purity > 97% (HPLC)
CAS: 882-09-7; C₁₀H₁₁ClO₃

	017 3011	250	mg
	017 3012	1	g
	017 3013	5	g

2-INDOL-3-YL-4OXO-4-PHENYLBUTANOIC ACID (PEO-IAA) [α-(2-Oxo-2-phenylethyl)-1H-Indole-3-acetic acid]

MW 293.33; crystalline; purity > 98% (HPLC)
CAS: 6266-66-6; C₁₈H₁₅NO₃

	017 7291	1	mg
	017 7292	2	mg
	017 7293	5	mg

2-(4-ETHOXYPHENYL)ACETIC ACID (PISA)

MW 180.21; crystalline; purity > 98% (HPLC)
CAS: 4919-33-9; C₁₀H₁₂O₃

	017 7931	5	mg
	017 7932	10	mg
	017 7933	50	mg

2-(3-ETHOXYPHENYL)ACETIC ACID (mPISA)

MW 180.21; crystalline; purity > 98% (HPLC)
CAS: 72775-83-8; C₁₀H₁₂O₃

	017 7941	5	mg
	017 7942	10	mg
	017 7943	25	mg