15% to 25% of {HEAD ~ an alkali metal salt} of {TAIL ~ an alpha olefin sulfonate surfactant} 
of
15 % to 25 % of { HEAD ~ an alkali metal salt } of { TAIL ~ an alpha olefin sulfonate surfactant }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL