Characterization of 2-Epicastasterone from Immature Seeds of Phaseolus vulgaris

Abstract

), most likely from an A ring methaneboronate. Coupled with a distinct retention time on GC from that of CS BMB, our findings suggest that the compound is an isomer of CS.In a 400 MHz proton NMR study (Table 2), absorptions for four methyls (C-21, C-26, C-27 and C-28) and two protons at C-22 and C-23 in the side chain of the isomer of CS were exactly the same as those of CS, indicating that the side chain structure of the isomer is identical to that of CS. In addition, signals for H