(1aS,2S,10R,10aR)-2,7-bis((tert-butyldiphenylsilyl)oxy)-9-diazo-10a-methyl-3,8-dioxo-1a,3,8,9,10,10a-hexahydro-2H-benzo[6,7]fluoreno[2,3-b]oxiren-10-yl acetate

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

(1aS,2S,10R,10aR)-2,7-bis((tert-butyldiphenylsilyl)oxy)-3,8-dimethoxy-10a-methyl-9-oxo-1a,9,10,10a-tetrahydro-2H-benzo[6,7]fluoreno[2,3-b]oxiren-10-yl acetate

(1aS,2S,10R,10aR)-2,7-dihydroxy-3,8-dimethoxy-10a-methyl-9-oxo-1a,9,10,10a-tetrahydro-2H-benzo[6,7]fluoreno[2,3-b]oxiren-10-yl acetate

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

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

(1R,5R,6R)-4-(((tert-butyldimethylsilyl)oxy)methyl)-3-(1,4-dimethoxy-5-(methoxymethoxy)naphthalen-2-yl)-5-hydroxy-6-methyl-7-oxabicyclo[4.1.0]hept-3-en-2-one

(1R,2R,5S,6S)-2-acetoxy-5-((tert-butoxycarbonyl)oxy)-4-(1,4-dimethoxy-5-(methoxymethoxy)naphthalen-2-yl)-1-methyl-7-oxabicyclo[4.1.0]hept-3-ene-3-carboxylic acid

tributyl(1,4-dimethoxy-5-(methoxymethoxy)naphthalen-2-yl)stannane

(1aS,2S,10R,10aR)-2,7-bis((tert-butyldiphenylsilyl)oxy)-9-diazo-10a-methyl-3,8-dioxo-1a,3,8,9,10,10a-hexahydro-2H-benzo[6,7]fluoreno[2,3-b]oxiren-10-yl isobutyrate

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

(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

(1aS,2S,10R,10aR)-2,7-bis((tert-butyldiphenylsilyl)oxy)-3,8-dimethoxy-10a-methyl-9-(2-(methylsulfonyl)hydrazineylidene)-1a,9,10,10a-tetrahydro-2H-benzo[6,7]fluoreno[2,3-b]oxiren-10-yl acetate