CHEM.DB.Env: Various constants for use by the module, but these can / should
be changed depending on the platform / environment where they are
installed.
CHEM.DB.rdb.BeautifulSoup: Beautiful Soup
Elixir and Tonic
"The Screen-Scraper's Friend"
http://www.crummy.com/software/BeautifulSoup/
Beautiful Soup parses a (possibly invalid) XML or HTML document into a
tree representation.