Canagliflozin impurity D

Canagliflozin impurity D is a structurally related degradation byproduct arising from oxidative cleavage of the fructofuranoside core in the parent compound. It retains the benzene-1,3-diol and piperazine moieties but features a truncated aliphatic chain with a terminal carboxylic acid group, distinguishing it from the parent drug's glucose-like scaffold. This impurity forms under acidic stress conditions during synthesis, reflecting a specific pathway of hydrolytic instability. It serves as a critical HPLC reference standard for quantifying degradation products in stability studies of canagliflozin formulations.