(4S)-2-{(R)-carboxy-[(2-thien-2-ylacetyl)amino]methyl}-5-methylene-5,6-dihydro-4H-1,3-thiazine-4-carboxylic acid
(4s)-2-{(r)-carboxy-[(2-thien-2-ylacetyl)amino]methyl}-5-methylene-5,6-dihydro-4h-1,3-thiazine-4-carboxylic acid