(1aS,2S,10R,10aR)-10-acetoxy-3,8-dimethoxy-7-(methoxymethoxy)-10a-methyl-9-oxo-1a,9,10,10a-tetrahydro-2H-benzo[6,7]fluoreno[2,3-b]oxiren-2-yl 4-azidobutanoate

(7R,7aR,8aS,9S)-7-acetoxy-1-hydroxy-11-methoxy-7a-methyl-6-oxo-7,7a,8a,9-tetrahydro-6H-benzo[h]oxireno[2',3':4,5]benzo[1,2-c]chromen-9-yl 4-azidobutanoate

(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,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,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