4,4'-dimethoxy-2,5,2',5'-tetrahydroxybiphenyl

2-(2,5-dihydroxy-4-methoxyphenyl)-5-methoxycyclohexa-2,5-diene-1,4-dione

(2,4,5-trihydroxy-phenyl)-glyoxylic acid

2,4,5-三甲氧基苯甲酸

3,4-二甲氧基苯酚