| —— | Tert-butyl 5-methoxy-2,2-bis(3-methoxy-3-oxopropyl)-3-oxoindole-1-carboxylate | 1639425-70-9 | C22H29NO8 | 435.474 | 
                                                                                                                                            
                                        | —— | Tert-butyl 5'-methoxy-3',4-dioxospiro[cyclohexane-1,2'-indole]-1'-carboxylate | 1639425-72-1 | C19H23NO5 | 345.395 | 
                                                                                                                                            
                                        | —— | tert-butyl 5-methoxy-3-oxodispiro[indoline-2,1'-cyclohexane-4',2''-[1,3]dioxolane]-1-carboxylate | 1639425-82-3 | C21H27NO6 | 389.448 | 
                                                                                                                                            
                                        | —— | ethyl (E)-2-(5'-methoxy-4-oxospiro[cyclohexane-1,2'-indolin]-2-en-3'-ylidene)acetate | 1639425-84-5 | C18H19NO4 | 313.353 | 
                                                                                                                                            
                                        | —— | tert-butyl (3'E)-3'-(2-ethoxy-2-oxoethylidene)-5'-methoxy-4-oxospiro[cyclohexane-1,2'-indole]-1'-carboxylate | 1639425-74-3 | C23H29NO6 | 415.486 | 
                                                                                                                                            
                                        | —— | methyl (3'E)-3'-(2-ethoxy-2-oxoethylidene)-5'-methoxy-6-oxospiro[cyclohexene-3,2'-indole]-1'-carboxylate | 1639425-67-4 | C20H21NO6 | 371.39 | 
                                                                                                                                            
                                        | —— | tert-butyl (3'E)-3'-(2-ethoxy-2-oxoethylidene)-5'-methoxy-6-oxospiro[cyclohexene-3,2'-indole]-1'-carboxylate | 1639425-75-4 | C23H27NO6 | 413.47 |