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.
ent-11alpha-Hydroxyabieta-8(14),13(15)-dien-16,12alpha-olide shows significant cytotoxic activity against ANA-1 and Jurkat cells with IC50 values 7.12 x 10(-3) and 1.79 x 10(-2) microM.