| —— | ethyl (1R,2R,3R,5R,7R,8S)-6-oxo-4-oxatetracyclo[6.2.1.02,7.03,5]undec-9-ene-2-carboxylate | 81330-18-9 | C13H14O4 | 234.252 | 
                                                                                                                                            
                                        | —— | rac-ethyl (1aR,1bR,2R,5S,5aR,6aR)-6,6-dimethoxy-1a,2,5,5a,6,6a-hexahydro-1bH-2,5-methanoindeno[1,2-b]oxirene-1b-carboxylate | 81330-19-0 | C15H20O5 | 280.321 | 
                                                                                                                                            
                                        | —— | ((1aS,1bR,2S,5R,5aS,6aS)-6,6-dimethoxy-1a,2,5,5a,6,6a-hexahydro-1bH-2,5-methanoindeno[1,2-b]oxiren-1b-yl)methanol | 81330-20-3 | C13H18O4 | 238.284 | 
                                                                                                                                            
                                        | —— | ethyl 5-oxo-tricyclo[5.2.1.0.]deca-3,8-diene-2-carboxylate | 121312-57-0 | C13H14O3 | 218.252 |