(S)-2-ethyl-2-hydroxy-3-oxobutanoate = (R)-3-hydroxy-3-methyl-2-oxopentanoate
(s)-2-ethyl-2-hydroxy-3-oxobutanoate = (r)-3-hydroxy-3-methyl-2-oxopentanoate
(S)-2-ethyl-2-hydroxy-3-oxobutanoate = (R)-3-hydroxy-3-methyl-2-oxopentanoate
(s)-2-ethyl-2-hydroxy-3-oxobutanoate = (r)-3-hydroxy-3-methyl-2-oxopentanoate