Thidiazauron (1-Phenyl-3-(1,2,3-thiadiazol-5-yl)-harnstoff; 1-phenyl-3-(1,2,3-thiadiazol-5-yl)urea; TDZ

1-phenyl-3-(1,2,3-thiadiazol-5-yl)urea

C₉H₈N₄OS

Form Colourless, odourless crystals.

Melting point 210.5-212.5℃ (decomp.).

Solubility In water 31 mg/l (pH 7, 25℃). In hexane 0.002, methanol 4.20, dichloromethane 0.003, toluene 0.400, acetone 6.67, ethyl acetate 1.1 (all in g/l, 20℃).

Oral Acute oral LD50 for mice >5000, rats >4000 mg/kg.

Skin and eye Acute percutaneous LD50 for rats >1000, rabbits >4000 mg/kg.

Mild eye irritant; non-irritating to skin (rabbits). No skin sensitisation (guinea pigs).

Inhalation LC50 (4 h) for rats >2.3 mg/l air.

Used for defoliation of cotton, in order to facilitate harvesting; applied at 0.21 kg/ha per season.

Description: White solid, free from visible extraneous matter;

Active Ingredient Content(w/w): ≥95%;

Water (w/w): ≤0.5%; pH Range: 4.0~7.0;

Soild Insoluble Material(w/w): ≤1.0%