1 MS8 (2r,3ar,7ar)-2-[(2s)-2-amino-3-hydroxy-3-oxo-propyl]-3,3a,5,6,7,7a-hexahydrofuro[4,5-B]pyran-2-carboxylic acid 1.000 2 8DX (2r,3ar,6s,7ar)-2-[(2s)-2-amino-3-hydroxy-3-oxo-propyl]-6-hydroxy-3,3a,5,6,7,7a-hexahydrofuro[4,5-B]pyran-2-carboxylic acid 0.947 3 9DX (2r,3ar,7r,7ar)-2-[(2s)-2-amino-3-hydroxy-3-oxo-propyl]-7-hydroxy-3,3a,5,6,7,7a-hexahydrofuro[4,5-B]pyran-2-carboxylic acid 0.947 4 8EP (2r,3ar,6r,7s,7ar)-2-[(2s)-2-amino-3-hydroxy-3-oxo-propyl]-6,7-dihydroxy-3,3a,5,6,7,7a-hexahydrofuro[4,5-B]pyran-2-carboxylic acid 0.900 5 NDZ (2r,3ar,6r,7r,7ar)-2-[(2s)-2-amino-2-carboxyethyl]-6,7-dihydroxyhexahydro-2h-furo[3,2-B]pyran-2-carboxylic acid 0.900 6 DYH (2r,3ar,6s,7r,7ar)-2-[(2s)-2-amino-2-carboxyethyl]-6-hydroxy-7-(methylamino)hexahydro-2h-furo[3,2-B]pyran-2-carboxylic acid 0.857