Chemical name: mixture of 80% (10E,14E,16E)-(1R,4S,5′S,6S,6′R,8R,12S,13S,20R,21R,24S)-6′-[(S)-sec-butyl]-21,24-dihydroxy-5′,11,13,22-tetramethyl-2-oxo-(3,7,19-trioxatetracyclo[15.6.1.14,8.020,24]pentacosa-10,14,16,22-tetraene)-6-spiro-2′-(5′,6′-dihydro-2′H-pyran)-12-yl 2,6-dideoxy-4-O-(2,6-dideoxy-3-O-methyl-α-L-arabino-hexopyranosyl)-3-O-methyl-α-L-arabino-hexopyranoside and 20% (10E,14E,16E)-(1R,4S,5′S,6S,6′R,8R,12S,13S,20R,21R,24S)-21,24-dihydroxy-6′-isopropyl-5′,11,13,22-tetramethyl-2-oxo-(3,7,19-trioxatetracyclo[15.6.1.14,8.020,24]pentacosa-10,14,16,22-tetraene)-6-spiro-2′-(5′,6′-dihydro-2′H-pyran)-12-yl 2,6-dideoxy-4-O-(2,6-dideoxy-3-O-methyl-α-L-arabino-hexopyranosyl)-3-O-methyl-α-L-arabino-hexopyranoside
CAS no.: 71751-41-2

Structural formula:

Molecular formula: C₄₈H₇₂O₁₄ (avermectin B1a) + C₄₇H₇₀O₁₄ (avermectin B1b)
Physical & chemical property:
Physical State: Colourless to pale yellow crystals
Melting point: 161.8-169.4°C
Density: 1.18(20°C)
Solubility: In water 7-10μg/l (20°C). In toluene 350, acetone 100, isopropanol 70, chloroform 25, ethanol 20, methanol 19.5, n-butanol 10, cyclohexane 6 (all in g/l, 21°C)
Stability: Stable to hydrolysis in aqueous solutions at pH 5, 7 and 9 (25°C). Sensitive to stronger acid and base. U.V. irradiation causes conversion first to the 8,9-Z-isomer, then to unidentified decomposition products.
Specification: 95%TC, 1%EC, 1.8%EC
Uses: Control of motile stages of mites, leaf miners, suckers, Colorado beetles, etc. on ornamentals, cotton, citrus fruit, pome fruit, nut crops, vegetables, potatoes, and other crops.