| 摘要 |
PCT No. PCT/JP93/01490 Sec. 371 Date Apr. 17, 1995 Sec. 102(e) Date Apr. 17, 1995 PCT Filed Oct. 18, 1993 PCT Pub. No. WO94/08958 PCT Pub. Date Apr. 28, 1994Highly crystalline vitamin D derivatives are represented by the formula: <IMAGE> (where R1 is a straight or branched C4-C9 alkyl group optionally having a hydroxyl group; R2 and R3 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.
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