O-ethyl-carbonic 5-ethyl-2,4-dimethyl-pyrrole-3-carboxylic anhydride   、                                                                                      
箭毒蛙毒素A                                                                                                                                                              在
                                                                                                                                                                                 
sodium hydroxide   、                                                                                                  
氯甲酸乙酯                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
氯仿                                                                                  为溶剂,
                                                                                                                                                                                        生成                                                 1-(9,12-dihydroxy-2,11a-dimethyl-1,2,3,4,7a,8,9,10,11,11a,12,13-dodecahydro-7H-9,11b-epoxy-13a,5a-prop[1]enophenanthro[2,1-f][1,4]oxazepin-14-yl)ethyl 5-ethyl-2,4-dimethyl-1H-pyrrole-3-carboxylate