{HEAD ~ The process} according to {TAIL ~ this invention} can produce 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 
according to
{ HEAD ~ The process } according to { TAIL ~ this invention } can produce 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 HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH