For actual synthesis, the appropriate reagents and reaction conditions are applied to {HEAD ~ a reaction vessel} containing {TAIL ~ the specified quantity} of beads 
containing
For actual synthesis , the appropriate reagents and reaction conditions are applied to { HEAD ~ a reaction vessel } containing { TAIL ~ the specified quantity } of beads
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH