Changes in the Chemical Components of Processed Rehmanniae Radix Distillate during Different Steaming Times

Figure 1

The chemical structure of standards: (a) catalpol, (b) rehmannioside A, (c) rehmannioside D, (d) leonuride, (e) aucubin, and (f) verbascoside.

(a)

(b)

(c)

(d)

(e)

(f)