(1aS,2S,10R,10aR)-3,8-dimethoxy-10a-methyl-9-oxo-7-(2,2,2-trifluoroacetoxy)-1a,9,10,10a-tetrahydro-2H-benzo[6,7]fluoreno[2,3-b]oxirene-2,10-diyl diacetate

(1aS,2S,10R,10aR)-3,8-dimethoxy-7-(methoxymethoxy)-10a-methyl-9-oxo-1a,9,10,10a-tetrahydro-2H-benzo[6,7]fluoreno[2,3-b]oxirene-2,10-diyl diacetate

(1aS,2S,10R,10aR)-7-hydroxy-3,8-dimethoxy-10a-methyl-9-oxo-1a,9,10,10a-tetrahydro-2H-benzo[6,7]fluoreno[2,3-b]oxirene-2,10-diyl diacetate

(1R,2R,5S,6S)-4-(1,4-dimethoxy-5-(methoxymethoxy)naphthalen-2-yl)-3-(hydroxymethyl)-1-methyl-7-oxabicyclo[4.1.0]hept-3-ene-2,5-diyl diacetate

(1R,2R,5S,6S)-5-((tert-butoxycarbonyl)oxy)-4-(1,4-dimethoxy-5-(methoxymethoxy)naphthalen-2-yl)-3-(hydroxymethyl)-1-methyl-7-oxabicyclo[4.1.0]hept-3-en-2-yl acetate