| http://www.w3.org/ns/prov#value | - The present invention is a process for the preparation of rofleponide of formula (II) ##STR1##where the 22R/22S ratio is 90/10 or greater which comprises contacting an acetonide of formula (I) ##STR2##with CH.sub.3 --CH.sub.2 --CH.sub.2 --CHO (III) in the presence of perchloric a
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