Are they included in Unicode for any reason? They're not textual and don't make any sense (they are actually ill-formed[1]) as independent glyphs.
[1] OK, they're not ill-formed if you really want to insert a miniature icon of a free benzene molecule into running text, but in chemistry you're mostly talking about benzene rings as a structural element in larger molecules, not molecular benzene.
[1] OK, they're not ill-formed if you really want to insert a miniature icon of a free benzene molecule into running text, but in chemistry you're mostly talking about benzene rings as a structural element in larger molecules, not molecular benzene.