(1S,2S,3R,4R)-3-(tert-butyl)dimethylsilyloxymethyl-1,4-epoxy-2-hydroxymethyl-6,7-methylenedioxy-1,2,3,4-tetrahydronaphthalene

(3R,4R)-4-allyloxy-2-formyl-6,7-methylenedioxy-3-triisopropylsilyloxymethyl-3,4-dihydronaphthalene

(3R,4R)-4-benzyloxy-2-formyl-6,7-methylenedioxy-3-triisopropylsilyloxymethyl-3,4-dihydronaphthalene

methyl (3R,4R)-4-allyloxy-6,7-methylenedioxy-3-triisopropylsilyloxymethyl-3,4-dihydronaphthalene-2-carboxylate

(3R,4R)-4-allyloxy-6,7-methylenedioxy-3-triisopropylsilyloxymethyl-3,4-dihydronaphthalene-2-carboxylic acid