(2R,3S)-3-isopropylmalate <=> (2S)-2-isopropylmalate
(2r,3s)-3-isopropylmalate <=> (2s)-2-isopropylmalate
(2R,3S)-3-isopropylmalate <=> (2S)-2-isopropylmalate
(2r,3s)-3-isopropylmalate <=> (2s)-2-isopropylmalate