and wherein T3 is a timing or linking group which functions by {HEAD ~ electron transfer} down {TAIL ~ a conjugated chain} and is represented by the formula ##STR25## wherein *** denotes the point of attachment to E2 and **** denotes the point of attachment to PUG 
and wherein T3 is a timing or linking group which functions by { HEAD ~ electron transfer } down { TAIL ~ a conjugated chain } and is represented by the formula # # STR25 # # wherein * * * denotes the point of attachment to E2 and * * * * denotes the point of attachment to PUG
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH