5-(1,2-Bis-isopropylcarbamoyloxymethyl-6,7-dihydro-5H-pyrrolizin-3-yl)-3-bromo-2-chloro-1-methyl-pyridinium; iodide                                                                                                                                                              在
                                                                                                                                                                                 phosphate buffer   、                                                                                                  
水                                                                                                                                  作用下,
                                                                                                                                                                                                                            生成                                                 Isopropyl-carbamic acid 3-(5-bromo-1-methyl-6-oxo-1,6-dihydro-pyridin-3-yl)-1-isopropylcarbamoyloxymethyl-6,7-dihydro-5H-pyrrolizin-2-ylmethyl ester