1,4-dihydroxy-5,6,8-trimethoxy-naphthalene-2,3-dicarboxylic acid dimethyl ester

2,3-bis-(tert-butyl-dimethyl-silanyloxymethyl)-1,4,5,6,8-pentamethoxy-naphthalene

6-formyl-7,8-dimethoxy-1-oxo-1H-isochromene-3-carboxylic acid methyl ester

(3-hydroxymethyl-1,4,5,7,8-pentamethoxy-naphthalen-2-yl)-methanol

1,4,5,6,8-pentamethoxy-naphthalene-2,3-dicarboxylic acid dimethyl ester