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CIS-4-CYCLOHEXENE-1,2-DICARBOXYLIC ACID 5-Norbornene-2,3-dicarboxylic acid MONO-METHYL CIS-5-NORBORNENE-ENDO-2,3-DICARBOXYLATE Carbic anhydride (S)-(-)-3-CYCLOHEXENECARBOXYLIC ACID Shikimic acid ETHYL 3-ENDO-AMINOBICYCLO[2.2.1]HEPT-5-ENE-2-ENDO-CARBOXYLATE HYDROCHLORIDE 3-ENDO-AMINOBICYCLO[2.2.1]HEPT-5-ENE-2-ENDO-CARBOXYLIC ACID