https://doi.org/10.1351/goldbook.15268
Polyamide containing pendent carboxy groups:
where \(\ce{R}\) is a constitutional unit with a connectivity three or higher.



Note: A polyamide acid is mostly prepared as a processable precursor giving a polyimide upon thermal curing. The polyamide acid prepared from benzene-1,2:4,5-tetracarboxylic dianhydride (formerly pyromellitic anhydride) and hexane-1,6-diamine (formerly hexamethylenediamine) is an example of such a precursor: 
