Natural PTP1B Inhibitors from Broussonetia papyrifera. -Two novel compounds (I) and (II) together with three known substances are isolated from the roots of the title plant. (I) shows an IC 50 of 4.3 µM in the PTP1B inhibition assay. -(CHEN, R. M.; HU*, L. H.; AN, T. Y.; LI, J.; SHEN, Q.; Bioorg. Med.
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