D-Isovaline3059-97-031 % similar DL-Isovaline465-58-731 % similar Isovaline595-39-131 % similar Isovaline595-40-431 % similar 1-Methylhydantoin616-04-631 % similar 1-Aminohydantoin6301-02-631 % similar Isophorone78-59-131 % similar Cardioxane149003-01-030 % similar