(+)-Fenchone4695-62-931 % similar (-)-Fenchone7787-20-431 % similar 3-Methyl-3-oxetanecarboxylic Acid28562-68-731 % similar 3,3,4,4,5,5,5-Heptafluoro-2-pentanone355-17-931 % similar 4,4-Dimethyl-2-pentanone590-50-131 % similar Ethyl 2,2-difluoroacetoacetate2266-48-030 % similar Methyl perfluorobutyl ketone678-18-230 % similar