what does an arsole look like?

Not what you were thinking...but is still a ring!

For more info on ths compound go to ChemSpider 

Here is a site that collects chemicals with unusual names - chemists can have a sense of humour when naming chemicals!
http://www.chm.bris.ac.uk/sillymolecules/sillymols.htm

Paul May has even written a book based on the website:

http://www.worldscibooks.com/popsci/p561.html