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