{HEAD ~ Reaction temperature} is usually {TAIL ~ 0°} to 100° C., preferably 20° to 80° C 
is usually
{ HEAD ~ Reaction temperature } is usually { TAIL ~ 0 ° } to 100 ° C. , preferably 20 ° to 80 ° C
HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH