The substituted C 076 compounds are prepared by {HEAD ~ various procedures} depending upon the position of the reaction site, and {TAIL ~ the particular C 076 compound} being substituted 
depending upon
The substituted C 076 compounds are prepared by { HEAD ~ various procedures } depending upon the position of the reaction site , and { TAIL ~ the particular C 076 compound } being substituted
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH