1 2TV (2r,5z)-5-[(acetyloxy)methylidene]-2-[(1r)-1-(formylamino)-2-oxoethyl]-5,6-dihydro-2h-1,3-thiazine-4-carboxylic acid 1.000 2 9EP (2r)-5-[(acetyloxy)methyl]-2-{(1r)-2-oxo-1-[(thiophen-2-ylacetyl)amino]ethyl}-3,6-dihydro-2h-1,3-thiazine-4-carboxylic acid 0.769 3 CFU (2r)-2-[(1r)-1-(acetylamino)-2-oxoethyl]-5-methyl-3,6-dihydro-2h-1,3-thiazine-4-carboxylic acid 0.762 4 0MU (2r)-5-(acetyloxymethyl)-2-[(1r)-1-[[(5r)-5-azanyl-6-oxidanyl-6-oxidanylidene-hexanoyl]amino]-2-oxidanylidene-ethyl]-5,6-dihydro-2h-1,3-thiazine-4-carboxylic acid 0.714