InChI=1/C6H12O3/c1-4(5(2)7)6(8)9-3/h4-5,7H,1-3H3/t4-,5+/m1/s butanoic acid, 3-hydroxy-2-methyl-, methyl ester, (2R,3S)- methyl (2R,3S)-3-hydroxy-2-methylbutanoate