Highly crystalline 22-oxavitamin D derivatives

摘要

Highly crystalline vitamin D derivatives are represented by the formula: ##STR1## (where R.sub.1 is a straight or branched C.sub.4 -C. sub. 9 alkyl group optionally having a hydroxyl group; R.sub.2 and R.sub. 3 which may be the same or different are each an acyl group), 22- oxavitamin D derivatives of high purity are produced by hydrolyzing said compounds which derivatives are useful as pharmaceuticals.