2-Oxopentanoic acid 2-ketovaleric acid 1821-02-9 C06255 alpha-Ketovaleric acid InChI=1/C5H8O3/c1-2-3-4(6)5(7)8/h2-3H2,1H3,(H,7,8 K9250_SIGMA 2-oxo-pentanoic acid 2-Ketopentanoic acid 2-Oxovaleric acid EINECS 217-340-2 CHEBI:33033 75950_FLUKA 2-Oxo-n-valeric acid .alpha.-Keto-n-valeric acid 2-keto valeric acid LMFA01060004