Component of the chloroacetanilide N-alkylformylase multicomponent enzyme system involved in the degradation of chloroacetanilide herbicides (N-alkoxyalkyl-N-chloroacetyl-substituted aniline derivatives). In vitro, functions as an intermediate electron transfer protein. Binds 1 [2Fe-2S] cluster. The chloroacetanilide N-alkylformylase multicomponent enzyme system is composed of an oxygenase component (CndA) and an electron transfer component formed by a ferredoxin reductase (CndC1) and a ferredoxin (CndB1). In vitro, chloroacetanilide N-alkylformylase assays in which CndB1 is substituted for CndB2 demonstrate that the two enzymes possess nearly identical activities. Belongs to the adrenodoxin/putidaredoxin family.