2-dehydro-L-erythronate <=> 3-dehydro-L-erythronate
2-dehydro-l-erythronate <=> 3-dehydro-l-erythronate
2-dehydro-L-erythronate <=> 3-dehydro-L-erythronate
2-dehydro-l-erythronate <=> 3-dehydro-l-erythronate