(2R,3R)-2-ethyl-3-methylsuccinic acid InChI=1/C7H12O4/c1-3-5(7(10)11)4(2)6(8)9/h4-5H,3H2,1-2H3,(H,8,9)(H,10,11)/t4-,5-/m1/s butanedioic acid, 2-ethyl-3-methyl-, (2R,3R)-