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, catalyzes the transfers of electrons from ferredoxin (CndB1) to NADH. N-dealkylase utilizes NADH, but not NADPH, as the electron donor. H(+) + NAD(+) + 2 reduced [2Fe-2S]-[ferredoxin] = NADH + 2 oxidized [2Fe-2S]-[ferredoxin] 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 FAD-dependent oxidoreductase family.