preferred_name: 2-dehydro-L-erythronate => 3-dehydro-L-erythronate
preferred_name_lc: 2-dehydro-l-erythronate => 3-dehydro-l-erythronate
label: 2-dehydro-L-erythronate => 3-dehydro-L-erythronate
label_lc: 2-dehydro-l-erythronate => 3-dehydro-l-erythronate