Even without further purification, very little impurity appears with this new intermediate, and it is sufficiently pure to directly undergo {HEAD ~ further dehydration} to {TAIL ~ Medrogestone} 
to
Even without further purification , very little impurity appears with this new intermediate , and it is sufficiently pure to directly undergo { HEAD ~ further dehydration } to { TAIL ~ Medrogestone }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL