| 摘要 |
A compound of structure (I), wherein R and R1 are each, independently, (a) or hydrogen; R2 is a heterocyclic radical which may be optionally substituted; n = 0-6; with the proviso that R and R1 are both not hydrogen, or a pharmaceutically acceptable salt thereof which is useful as an immunosuppressive, antiinflammatory, antifungal, antiproliferative, and antitumor agent.
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