3-羟基-2-甲基-2-环戊烯酮

9',10'-dihydrospiro[cyclopentane-1,11'-[9,10]ethanoanthracene]-2,5-dione

9,10-dihydro-11-methoxy-11-(2-oxo-1-trimethylsilyloxycyclobutyl)-9,10-ethanoanthracene