This is a good piece from BYO's mr wizard on Chlorphenols...
Quote:
Chemical off-flavors are frequently encountered in beer and can be caused by numerous factors. The most obvious cause comes from traces of cleaning or sanitizing chemicals left on equipment surfaces after use. Chemicals containing chlorine and iodine are well known contributors of chemical off-flavors if the compounds remain on the equipment. Of the two, chlorine is the worst because it can combine with malt phenols to form a class of compounds called chlorophenols, which have a pronounced medicinal aroma. Iodine sanitizers usually cause no problems if used at their recommended concentration.
Some brewers encounter problems with chlorine even without using chlorinated sanitizers. These problems are often traced to chlorinated tap water. If brewers use chlorinated tap water for rinsing brewing equipment, then chlorophenol off-flavors may arise. One well known craft brewer had a problem with chlorophenols in his fruit beer that was eventually traced to the fruit. The fruit source had been rinsed at the farm with chlorinated water and this chlorine was being introduced to the beer at the time of fruit addition. This problem took some good detective work to solve.
Medicinal aromas can also come from wild yeast contamination. In fact the classic indicator of wild yeast contamination in beer is a distinct phenolic aroma. This aroma is often likened to cloves or the smell of standard bandages.
This PDF may have some answers...I thought I did see Cambden mentioned in it.
http://www.google.com/url?sa=t&source=web&ct=res&cd=1&url=http%3A%2F%2Fw ww.probrewer.com%2Fresources%2Flibrary%2F42-phenolic.pdf&ei=F7XwSbSeN4ikNaWElb0P&usg=AFQjCNGcx QhIoK71wGiuDqxwJIrCKZtV4w