{HEAD ~ Compounds} of {TAIL ~ the invention} include all those compounds with the isoalloxazine backbone : 
of
{ HEAD ~ Compounds } of { TAIL ~ the invention } include all those compounds with the isoalloxazine backbone :
HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH