3,9-Dihydroxypterocarpan and phaseollidin are all good precursors of the pterocarpan phytoalexin phaseollin.

61135-91-9

C15H12O4

256.257

(< 1 mg/ml refers to the product slightly soluble or insoluble )
Powder: -20°C for 3 years
In solvent: -80°C for 2 years