1 SFR (2r)-2-[(1s,2r)-1-carboxy-2-hydroxypropyl]-5-[(2r)-oxolan-2-yl]-2,3-dihydro-1,3-thiazole-4-carboxylic acid 1.000 2 R3N (2r,5s)-2-[(1s,2r)-1-carboxy-2-hydroxy-propyl]-5-[(2r)-tetrahydrofuran-2-yl]-2,5-dihydrothiazole-4-carboxylic acid 1.000 3 DGF (2r,5r)-2-[(2s,3r)-3-hydroxy-1-oxobutan-2-yl]-5-[(2r)-tetrahydrofuran-2-yl]-2,5-dihydro-1,3-thiazole-4-carboxylic acid 0.950