1,8-dimethoxy-5-(t-butyldimethylsilyloxy)-4-methoxycarbonyl-3-methoxymethyl-9H-xanthen-9-one

1,8-dimethoxy-5-(t-butyldimethylsilyloxy)-4-formyl-3-methoxymethyl-9H-xanthene-D9,δ-butane

5-(t-butyldimethylsilyloxy)-1,8-dimethoxy-4-(ethyl-3'-formylpropanoate)-3-O-methoxymethyl-9H-xanthen-Δ9,δ-butane

1-(acetaldehyde)-10-(t-butyldimethylsilyloxy)-5,7-dimethoxy-2-[tris(1-methylethyl)siloxy]-6H-furo[2,3-c]-xanthen-6-one

[10-(tert-Butyl-dimethyl-silanyloxy)-6-but-(E)-ylidene-5,7-dimethoxy-2-triisopropylsilanyloxy-1,2-dihydro-6H-3,11-dioxa-cyclopenta[a]anthracen-1-yl]-acetaldehyde