preferred_name: a 3-dehydro-D-guloside <=> a 3-dehydro-D-glucoside
preferred_name_lc: a 3-dehydro-d-guloside <=> a 3-dehydro-d-glucoside
label: a 3-dehydro-D-guloside <=> a 3-dehydro-D-glucoside
label_lc: a 3-dehydro-d-guloside <=> a 3-dehydro-d-glucoside