13748-90-8 L-.alpha.-Hydroxyisocaproic acid L-2-Hydroxy-4-methylvaleric acid L-Leucic acid NSC152493 Pentanoic acid, 2-hydroxy-4-methyl-, (S)- Valeric acid, 2-hydroxy-4-methyl-, L- Valeric acid, 2-hydroxy-4-methyl-, L-(+)-