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Chemical structures and initial degradation steps of the CPPs metalaxyl-M (a) and lufenuron (b). CGA 62826, CGA 67868, CGA 238277, and CGA 224443 are the major metabolites of metalaxyl-M and lufenuron monitored in this study. The degradation end products were nonextractables and CO2. The sixfold 14C-labeled aromatic rings (asterisks) and pseudo-first-order rate constants (k1 to k3) are indicated. Degradation steps observed exclusively in nonsterile soil are indicated by dashed arrows.
