Task: Answer Verification
Input (English): Question: Is isatis canescens a rich source of glucobrassicin and other health-promoting compounds?
Answer: I. canescens flower buds represent a naturally rich source of GBS, at a level suitable for its purification. Furthermore, flower bud consumption could provide an intake of health-promoting compounds, with possible antioxidant and chemopreventive properties.
Output (English): yes