3-(β-D-Glucopyranosyloxy)-1,6-dihydroxy-2-methyl-9,10-anthracenedione, also known as an anthraquinone, has been specifically extracted from Rubia cordifolia.
2-Naphthalenecarboxylic acid, 4-(D-glucopyranosyloxy)-1-hydroxy-3-(3-hydroxy-3-methylbutyl)-, methyl ester (compound 3) is a naturally occurring substance found in the dried roots of Rubia cordifolia.
(E)-4-(3,4-dimethoxyphenyl)but-3-en-1-ol may promote melanin synthesis via USF1 dependent fashion and could be used as a clinical therapeutic agent against hypopigmentation-associated diseases.