The grey drainpipe above is Farnesene, or systemically (E)-7,11-Dimethyl-3-methylene-1,6,10-dodecatriene. It is described as having a sweet woody and citrus aroma. It is a major constituent of the essential oils of most hops. I apologise for the brevity of this post but I am playing catch up after Belgium and before Birmingham while trying to get my thesis progress report together for submission on Monday. If I get in a really bad mood I'll post it on my blog so you have to be bored to death by it as well!