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.

1-N-NAPHTHYLPHTHALAMIC ACID (NPA)

MW 291.31; crystalline; purity > 97% (HPLC)
S:26, 36; CAS: 132-66-1; C18H13NO3
	018 3041	10	mg
	018 3042	50	mg
	018 3043	250	mg

2,3,5-TRIIODOBENZOIC ACID (TIBA)

MW 499.81; crystalline; purity > 97% (HPLC)
R:22, S:22, 26, 36; CAS: 88-82-4; C7H3I3O2
	018 3051	5	g
	018 3052	25	g
	018 3053	100	g

1-PYRENOYLBENZOIC ACID (PBA)

MW 350.38; crystalline; purity > 97% (HPLC)
S:26, 36; CAS: 58926-23-1; C24H14O3
	018 3061	5	mg
	018 3062	25	mg
	018 3063	100	mg

The most active synthetic phyrothropin.

QUERCETIN DIHYDRATE [3,3´,4´,5,7-pentahydroxyflavone]

MW 338.28; crystalline; purity > 97% (HPLC)
R:25, S:45; CAS: 6151-25-3; C15H10O7.2H2O
	018 3071	10	mg
	018 3072	50	mg
	018 3073	250	mg

Naturally occurring flavonoid with polar auxin transport inhibiting activity.

APIGENIN [4´,5,7-trihydroxyflavone]

MW 270.24; crystalline; purity > 95% (HPLC)
R:36/37/38, S:26, 36; CAS: 520-36-5; C15H10O5
	018 3081	5	mg
	018 3082	10	mg
	018 3083	50	mg