{HEAD ~ Hydrocarbyl} is {TAIL ~ an organic group} composed solely of carbon and, as appropriate, hydrogen, and may be aliphatic, alicyclic, aromatic, or combinations thereof, being aliphatically saturated or unsaturated, normally having not more than about one site of unsaturation 
{ HEAD ~ Hydrocarbyl } is { TAIL ~ an organic group } composed solely of carbon and , as appropriate , hydrogen , and may be aliphatic , alicyclic , aromatic , or combinations thereof , being aliphatically saturated or unsaturated , normally having not more than about one site of unsaturation
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