D-Talono-1,4-Lactone is sugar compound in furanose form that can be converted inbto aldose or aldonic acid form through the use of fungal pyranose dehydrogenase.
Ohrui, H. et al.: Agri. Biolog. Chem., 49, 3319 (1985); Sedmera, P. et al.: J. Mol. Cata. B. Enz., 41, 31 (2006);