Synthesis and Biological Activity of Arylspiroborate Salts Derived from Caffeic Acid Phenethyl Ester

Figure 4

Chromatograms obtained for CAPE (3) at 270 nm (a) and 236 nm (b). Peaks are identified as follows: (A) 19-OH PGB₂ (internal standard), (B) PGB₂ (internal standard), and (C) CAPE (3). The inset in (b) shows the UV spectrum of peak C.

(a)

(b)