Use of synthetic and pest control methods. 1. Characteristic 1: a component composed of molecules according to formula (1), wherein (a) a is a compound according to formula (2) or (3)；(b) R1 is h, F, Cl, Br, I, CN, no.832222；C₁₋₆-substituted or unsubstituted alkyl, C₂₋₆-substituted or unsubstituted alkenyl, C₁₋₆-substituted or unsubstituted alkoxy, C₁₋₆-substituted or unsubstituted alkenyl-oxy, C₁₋₆-substituted or unsubstituted cycloalkyl, C₃₋-cycloalkenyl ₁₀ substituted or unsubstituted, C₆₋₂₀ substituted or unsubstituted aryl, C₁₋₂₀ substituted or unsubstituted heterocyclyl, OR⁹,C (3DX) RC (3DX) ORC (3DX) N (R)N (R)N (R) C (3DX) RS (O) RS (O) ORS (o) 8345n (r83313) 83222 or r8313； s (o) 8345r8313；Anyone can view this photoa. The replaced member or members selected from F, Cl, Br, I, CN, no832222；1. Lease land No. c833218331 and 832626；C₂₋₆ alkenyl,haloalkyl C₁₋₆,haloalkenyl C₂₋₆,haloalquil C -oxi haloalquenil C -oxi cicloalquilo Ccycloalkenyl C₃₋₁₀,C₃₋₁₀ halocycloalkyl,C₃₋₁₀ halocycloalkenyl,Or8313,S (O) ORC₆₋₂₀ aryl or C₁₋₂₀ heterocyclyl (each of which may be optionally substituted by R⁹)；(c) R2 is h, F, Cl, Br, I, CN, no.832222；C₁₋₆-substituted or unsubstituted alkyl, C₂₋₆-substituted or unsubstituted alkenyl, C₁₋₆-substituted or unsubstituted alkoxy, C₁₋₆-substituted or unsubstituted alkenyl-oxy, C₁₋₆-substituted or unsubstituted cycloalkyl, C₃₋-cycloalkenyl ₁₀ substituted or unsubstituted, C₆₋₂₀ substituted or unsubstituted aryl, C₁₋₂₀ substituted or unsubstituted heterocyclyl, OR⁹,C (3DX) RC (3DX) ORC (3DX) N (R)N (R)N (R) C (3DX) RSR8313,S (o) 834513 or r8313； s (o) 8345r8313；In every part of the rivera. The replaced member or members selected from F, Cl, Br, I, CN, no832222；1. Lease land No. c833218331 and 832626；C₂₋₆ alkenyl,haloalkyl C₁₋₆,haloalkenyl C₂₋₆,haloalquil C -oxi haloalquenil C -oxi cicloalquilo Ccycloalkenyl C₃₋₁₀,C₃₋₁₀ halocycloalkyl,C₃₋₁₀ halocycloalkenyl,Or8313,S (O) ORC₆₋₂₀ aryl or C₁₋₂₀ heterocyclyl (each of which may be optionally substit
