Bicyclo(2.2.1)heptane-1,4-dicarboxylic acid15544-51-130 % similar 1,1-Cyclobutanedicarboxylic acid5445-51-230 % similar 2-Hydroxyisobutyric acid594-61-630 % similar Hydroxycitric acid6205-14-730 % similar Gadoteric acid72573-82-130 % similar