{HEAD ~ The process} according to this invention can produce {TAIL ~ an estrone} acetal at a high yield and with economical advantages in the industrial scale and the estrone acetal thus obtained is useful as an estrone precursor which is important as a female hormone 
{ HEAD ~ The process } according to this invention can produce { TAIL ~ an estrone } acetal at a high yield and with economical advantages in the industrial scale and the estrone acetal thus obtained is useful as an estrone precursor which is important as a female hormone
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