Glucose levels in rats with hyperglycemia induced by streptozotocin we
re determined after ip administration of marsupsin (1), pterosupin (2)
, and pterostilbene (3), three important phenolic constituents of the
heartwood of Pterocarpus marsupium. Marsupsin and pterostilbene signif
icantly lowered the blood glucose level of hyperglycemic rats, and the
effect was comparable to that of 1,1-dimethylbiguanide (metformin).