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Chemical Identification
Common Name
Pencycuron
中文通用名
戊菌隆
IUPAC
1-(4-chlorobenzyl)-1-cyclopentyl-3-phenylurea
CAS
N-[(4-chlorophenyl)methyl]-N-cyclopentyl-N′-phenylurea
CAS No.
66063-05-6
Molecular Formula
C19H21ClN2O
Molecular Structure
Category
Activity
Fungicide
Premix
Dry seed dressing, dustable powder, flowable concentrate for seed treatment, suspension concentrate, wettable powder. 
Premix Parters: cumyluron;
Physical Properties
Molecular weight:328.8; Physical form:Colourless, odourless crystals. Density:1.22 (20 °C); Melting point:128 °C (modification A); 132 °C (modification B); Vapour pressure:5 ×10-7 mPa (20 °C, extrapolated); Henry constant:5 × 10-7 Pa m3 mol-1 (20 °C); Partition coefficient(n-octanol and water):logP = 4.68 (20 °C); Solubility:In water 0.3 mg/l (20 °C). In dichloromethane 270, toluene 20, n-hexane 0.12 (all in g/l, 20 °C).; Stability:On hydrolysis (25 °C), DT50 280 d ( pH 4), 22 y ( pH 7), 17 y ( pH 9). Photodegrades in water and on soil surfaces.
Toxicology
Oral:Acute oral LD50 for rats >5000 mg/ kg. Percutaneous:Acute percutaneous LD50 (24 h) for rats and mice >2000 mg/kg. Non-irritating to skin and eyes (rabbits). Not a skin sensitiser. Inhalation: LC50 (4 h) for rats >268 mg/m3 air (aerosol); >5130 mg/m3 air (dust). ADI:( JMPR) 0.03 mg/ kg b.w. [1992].
Environmental Profile
Ecotoxicology: 
Algae: EC50 (96 h) for Scenedesmus 0.56 mg/l.Bees:Not hazardous to bees; LD50 (oral and contact) >100µg/bee.Birds: LD50 for bobwhite quail >2000 mg/ kg.Daphnia: EC50 (48 h) 0.27 mg/l.Fish: LC50 (96 h) for rainbow trout >690 mg/l (11 °C), bluegill sunfish 127 mg/l (19 °C).Worms: LC50 (14 d) >1000 mg/ kg dry soil.Other beneficial spp.:Not toxic for carabid beetles (Calathus fuscipes, Pterostichus melanarius) up to 25 kg/ha. Under practical conditions, no negative effects on soil micro-organisms.

Environmental fate: 
Animals:In rats, following oral administration, up to 74% is eliminated within 3 days in the urine and faeces, either as the unchanged material or as metabolites. Eleven metabolites have been identified (I. Ueyama et al., J. Agric. Food Chem.Soil:Leaching and adsorption behaviour in soil characterises the compound as slightly mobile. Degraded in soil very effectively in laboratory studies. Based on determined DT50 values, the compound can be classified as moderately stabPlant:Degradation only to a low degree. The hydroxylated metabolites (partly as conjugates) can be considered to be the main metabolites.
Transport Information
Signal Word:CAUTION; Hazard Class:III(Slightly hazardous)

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Country:  China