(S)-4-Ethyl-4-hydroxy-10-((E)-2-trimethylsilanyl-vinyl)-1,12-dihydro-4H-2-oxa-6,12a-diaza-dibenzo[b,h]fluorene-3,13-dione 在
三氟乙酸 作用下,
生成 (19S)-8-ethenyl-19-ethyl-19-hydroxy-17-oxa-3,13-diazapentacyclo[11.8.0.02,11.04,9.015,20]henicosa-1(21),2,4,6,8,10,15(20)-heptaene-14,18-dione