Table 1.

Structures, IC₅₀ and CRs of the title phenylurea compounds. The antibody (with a better titer and cross-reactivity, 80000 U and 83.1%, respectively) obtained from number II rabbit was used to establish the ELISA method.

Analytes	R1	R2	R3	IC50 (µg/L)	CRs (%)
Fluometuron	-CF3	-H	-CH3	1.67	100.00
Neburon	-Cl	-Cl	-CH2CH2CH2CH3	2.41	69.40
Diuron	-Cl	-Cl	-CH3	8.35	19.99
Chlorbromuron	-Cl	-Br	-OCH3	9.77	17.10
Fenuron	-H	-H	-CH3	11.61	14.38
Linuron	-Cl	-Cl	-OCH3	42.71	3.91