3-(1-methyl-3-indolyl)-4-{1-[4-O-(2,3,4,6-tetra-O-acetyl-β-D-galactopyranosyl)-2,3,6-tri-O-acetyl-β-D-glucopyranosyl]-3-indolyl}furan-2,5-dione                                                                                                                                                              在
                                                                                                                                                                                 
air   、                                                                                                  
碘                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
苯                                                                                  为溶剂,
                                                                                                                                                                                        以35%的产率得到13-methyl-12-[2,3,4,6-tetra-O-acetyl-4-O-(β-D-galactopyranosyl)-2,3,6-tri-O-acetyl-β-D-glucopyranosyl]indolo[2,3-a]furano[3,4-c]carbazole-5,7-dione