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cis-4-Hydroxy-D-proline cis-4-Hydroxy-L-proline Methyl cis-4-Aminocyclohexanecarboxylate Hydrochloride cis-4-Aminocyclohexanol hydrochloride CIS-4-CYCLOHEXENE-1,2-DICARBOXYLIC ACID cis-4-Aminocyclohexanecarboxylic acid trans-4-Hydroxy-L-proline methyl ester hydrochloride N-Boc-Trans-4-Hydroxy-D-proline methyl ester FMOC-L-HYP(BOM)-OH N-Boc-cis-4-Hydroxy-L-proline