bicyclo[2.2.2]octane-3,3-dicarboxylic acid

bicyclo[3.2.2]nonane-3,3-dicarboxylic acid

bicyclo[3.3.1]nonane-9,9-dicarboxylic acid

spiro[bicyclo[2.2.1]heptane-7,3'-cyclobutane]-1',1'-dicarboxylic acid

[[(2R,3S,4R,5S)-5-(2,4-dioxopyridin-1-yl)-3,4-dihydroxyoxolan-2-yl]methoxy-hydroxyphosphoryl] phosphono hydrogen phosphate