(2-hydroxy-3-methoxybenzyl)proline

(4-hydroxy-2-methoxybenzyl)proline

(2-nitrobenzyl)proline

(4-nitrobenzyl)proline

(4-ethoxybenzyl)proline

(4-hydroxy-3,5-dimethylbenzyl)proline

(4-carboxybenzyl)proline

(4-boronobenzyl)proline

((2,3-dihydrobenzofuran-5-yl)methyl)proline

((5-chlorothiophen-2-yl)methyl)proline

((1H-pyrrolo[2,3-b]pyridin-3-yl)methyl)proline

(2-chlorobenzyl)proline

(4-chlorobenzyl)proline

(3-chlorobenzyl)proline

(4-fluoro-3-methylbenzyl)proline

cinnamylproline