{TAIL ~ Acids} such as sulfuric, hydrochloric, hydrobromic, phosphoric, {HEAD ~ trifluoroacetic} and trifluorosulfonic are acceptable 
{ TAIL ~ Acids } such as sulfuric , hydrochloric , hydrobromic , phosphoric , { HEAD ~ trifluoroacetic } and trifluorosulfonic are acceptable
TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH