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Several compounds have been synthesised that can act as auxin transport inhibitors, including NPA (1-N-naphthylphthalamic acid), CTD (2-carboxyphenyl-3-phenylpropane-1,3-dione), TIBA (2,3,5-triiodobenzoic acid), and NOA (1-napthoxyacetic acid). The compounds are auxin efflux inhibitors that block polar transport by preventing auxin efflux.

AUXIN TRANSPORT INHIBITORS (PHYTOTROPINS)

1-N-NAPHTHYLPHTHALAMIC ACID (NPA)

MW 291.31; crystalline; purity > 97% (HPLC)
CAS: 132-66-1; C₁₈H₁₃NO₃

	018 3041	10	mg
	018 3042	50	mg
	018 3043	250	mg

1-PYRENOYLBENZOIC ACID (PBA)

MW 350.38; crystalline; purity > 97% (HPLC)
CAS: 58926-23-1; C₂₄H₁₄O₃

	018 3061	5	mg
	018 3062	25	mg
	018 3063	100	mg

The most active synthetic phyrothropin.

Naturally occurring flavonoid with polar auxin transport inhibiting activity.

APIGENIN [4´,5,7-trihydroxyflavone]

MW 270.24; crystalline; purity > 95% (HPLC)
CAS: 520-36-5; C₁₅H₁₀O₅

	018 3081	5	mg
	018 3082	10	mg
	018 3083	50	mg

Naturally occurring flavonoid with polar auxin transport inhibiting activity.