N-[(5-Acetyl-3,6-dihydro-2H-[1,3]thiazin-2-yl)-carboxy-methoxy-methyl]-phthalamic acid 在
(benzotriazo-1-yloxy)tris(dimethylamino)phosphonium hexafluorophosphate 作用下,
生成 2-((6S,7S)-3-Acetyl-7-methoxy-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-en-7-yl)-isoindole-1,3-dione 、 2-((6R,7S)-3-Acetyl-7-methoxy-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-en-7-yl)-isoindole-1,3-dione