I love chemistry questions! I won't do your homework for you, but I will encourage you to visualize the problem and give you some logic to help solve it yourself.
Holly Phaneuf is a professional biochemist and a teacher, hence her book's great strengths: she has high standards for scientific evidence and for clear explanations, so we can understand and trust her down-to-earth conclusions and advice. Herbs Demystified is a uniquely informative contribution to the popular literature on herbs and health."
--Harold McGee, award-winning author of On Food and Cooking: The Science and Lore of the Kitchen