6',7'-dihydro-4,9,9'-trihydroxy-6-methoxy-3'-pentylspiro(2H-benz[f]indene-2,8'-[8H]cyclopent[g]isoquinoline)-1,1',3,5,8(2'H)-pentone 生成 (4'-acetyloxy-9-hydroxy-6'-methoxy-1,1',3',5',8'-pentaoxo-3-pentylspiro[6,7-dihydro-2H-cyclopenta[g]isoquinoline-8,2'-cyclopenta[b]naphthalene]-9'-yl) acetate