{HEAD ~ 3,7 Diamino phenazine leuco dyes} stabilized in {TAIL ~ the 10 position} with acyl substituents, said acyl substituents being themselves substituted with electron withdrawing groups 
stabilized in
{ HEAD ~ 3,7 Diamino phenazine leuco dyes } stabilized in { TAIL ~ the 10 position } with acyl substituents , said acyl substituents being themselves substituted with electron withdrawing groups
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH