I-acid ye-oxalic i-dihydrate (C₂H₂O₄·2H₂O) iyi-acid ye-organic enama-crystal esetshenziswa njengesisusi sokugqwala, njengesimhlophezi sokhuni nanjengesihlanzi seminerali. Itholakala ngokwemvelo ku-rhubarb nasesipinashini. Isetshenziswa futhi ekwelapheni i-varroa mite ekufuyweni kwezinyosi.