In addition to the natural auxins, a whole range of synthetic auxins are known. The most widely used are ?-naphthaleneacetic acid (NAA) and 2,4-dichlorophenoxyacetic acid (2,4-D). Used in high doses, auxin stimulates the production of ethylene. Excess ethylene can inhibit elongation growth, cause leaf abscission, and even kill the plant. 2,4-D and 2,4,5-trichlorophenoxyacetic acid (2,4,5-T) have been used as herbicides. Dicots are much more susceptible to auxins than monocots like grass and cereal crops.

PICLORAM [4-amino-3,5,6-trichloropicolinic acid]

MW 241.46; crystalline; purity > 98% (HPLC)
R:36, S:26, 36; CAS: 1918-02-1; C6H3Cl3N2O2
	016 2901	1	g
	016 2902	5	g
	016 2903	25	g

α-NAPHTALENEACETIC ACID (NAA)

MW 186.21; crystalline; purity > 98% (HPLC)
R: 22, 37/38, 41; S:22, 26 , 36; CAS: 86-87-3; C12H10O2
	016 2911	5	g
	016 2912	25	g
	016 2913	100	g

α-NAPHTALENEACETIC ACID POTASSIUM SALT (NAA-K)

MW 224.31; crystalline; purity > 90% (HPLC)
R: 36/37/38, S:26, 36; CAS: 15165-79-4; C12H9KO2
	016 6291	5	g
	016 6292	25	g
	016 6293	100	g

β-NAPHTALENEACETIC ACID (BNAA)

MW 186.21; crystalline; purity > 98% (HPLC)
R: 22, 37/38, 41; S:22, 26 , 36; CAS: 581-96-4; C12H10O2
	016 6731	5	g
	016 6732	25	g
	016 6733	100	g

α-NAPHTHOXYACETIC ACID (ANOA)

MW 202.21; crystalline; purity > 98% (HPLC)
R:22, 36/37/38, S:26, 36; CAS: 2976-75-2; C12H10O3
	016 6741	1	g
	016 6742	5	g
	016 6743	25	g

β-NAPHTHOXYACETIC ACID (BNOA)

MW 202.21; crystalline; purity > 98% (HPLC)
R:22, 36/37/38, S:26, 36; CAS: 120-23-0; C12H10O3
	016 2921	1	g
	016 2922	5	g
	016 2923	25	g
	016 2924	100	g

2,4-DICHLOROPHENOXYACETIC ACID (2,4-D)

MW 221.04; crystalline; purity > 97% (HPLC)
R:22, 36/37/38, S: 2, 24/25, 26, 36/37/39, 46, 61; CAS: 94-75-7; C8H6Cl2O3
	016 2931	10	g
	016 2932	25	g
	016 2933	50	g

3-CHLORO-4-HYDROXYPHENYLACETIC ACID (3Cl4HPA)

MW 186.60; crystalline; purity > 97% (HPLC)
R:36/37/38, S: 26, 37/39; CAS: 33697-81-3; C8H7ClO3
	016 6751	250	mg
	016 6752	1	g
	016 6753	5	g

2,4,5-TRICHLOROPHENOXYACETIC ACID (2,4,5T)

MW 255.49; crystalline; purity > 97% (HPLC)
R: 22, 37, 41, 43, 52/53, S: 2, 24/24, 26, 36/37/39, 46, 61;  CAS: 93-76-5; C8H5Cl3O3
	016 2941	10	g
	016 2942	25	g
	016 2943	100	g

DICAMBA [2-methoxy-3,6-dichlorobenzoic acid]

MW 221.04; crystalline; purity > 97% (HPLC)
R: 22, 41, 52/53, S: 2, 26, 61; CAS: 1918-00-9; C8H6Cl2O3
	016 2951	50	mg
	016 2952	250	mg
	016 2953	1	g

4-CHLOROPHENOXYACETIC ACID (4-CPA, CPA)

MW 186.60; crystalline; purity > 97% (HPLC)
R: 22, 42, 52/53, S: 26, 61; CAS: 122-88-3; C8H7ClO3
	016 2961	10	g
	016 2962	25	g
	016 2963	100	g