The process according to this invention is useful as {HEAD ~ a method} for producing {TAIL ~ an estrone} acetal as an estrone precursor in the industrial scale 
for producing
The process according to this invention is useful as { HEAD ~ a method } for producing { TAIL ~ an estrone } acetal as an estrone precursor in the industrial scale
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH