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