(1aS,3aR,6bR)-2-bromoacetyl-5-methyl-sulphanyloxy-1-oxo-1a,2,3,3a,4,6b-hexahydro-1H-2,6a-diazacyclobut[cd]indene-6-carboxylic acid 生成
(1aS,3aR,6bR)-5-Methylsulphonyloxy-2-(1-methyl-1H-tetrazol-5-ylsulphanylacetyl)-1-oxo-1a,2,3,3a,4,6b-hexahydro-1H-2,6a-diazacyclobut[cd]indene-6-carboxylic acid sodium salt