| CPC C07K 5/0804 (2013.01) [C07K 5/1016 (2013.01); A61K 38/00 (2013.01)] | 5 Claims |
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1. A compound having the structural formula (Ia),
![]() wherein
R1 is R′;
R is a C3-C6 cyclic alkyl group; and
R′ is a C1-C3 alkyl.
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