(1aS,3aR,6bR)-5-carbamoyloxymethyl-1-oxo-1a,2,3,3a,4,6b-hexahydro-1H-2,6a-diazacyclobut[cd]indene-6-carboxylic acid trifluoroacetate                                                                                                                                                                                                                                                                                                          生成                                                 
(1aS,3aR,6bR)-5-Carbamoyloxymethyl-2-methylsulphonyl-1-oxo-1a,2,3,3a,4,6b-hexahydro-1H-2,6a-diazacyclobut[cd]indene-6-carboxylic acid sodium salt