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 {HEAD ~ about one site} of unsaturation 
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 { HEAD ~ about one site } of unsaturation
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