Pterocarpans with inhibitory effects on protein tyrosine phosphatase 1B from Erythrina lysistemon Hutch.

Pterocarpans (1-3), named erylysins A-C, along with nine known pterocarpans (4-12), were isolated from the stem bark of Erythrina lysistemon Hutch. These prenylated compounds displayed significant inhibitory activity against protein tyrosine phosphatase 1B in an in vitro assay.