3-(10-Hydroxy-9-phenanthryl)-2-oxo-2H-phenanthro<9,10-b>pyran-4-carbonsaeureethylester                                                                                                                                                                                                                                                                                                          生成                                                 ethyl 17-hydroxy-16,33-dioxaoctacyclo[16.15.0.02,15.03,8.09,14.019,32.020,25.026,31]tritriaconta-2(15),3,5,7,9,11,13,17,19(32),20,22,24,26,28,30-pentadecaene-1-carboxylate