| CPC A61K 9/5015 (2013.01) [A61K 39/385 (2013.01); A61K 48/0033 (2013.01); C07C 271/20 (2013.01); C07D 295/13 (2013.01); C12N 15/113 (2013.01)] | 26 Claims |
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1. A compound of Formula IX-B-i:
![]() or a pharmaceutically acceptable salt thereof, wherein:
each L2 and L2′ is independently a bivalent saturated, straight or branched C1-12 hydrocarbon chain;
R1 is optionally substituted C1-20 aliphatic;
each R1′ is independently optionally substituted C1-20 aliphatic;
Y2 is a bivalent saturated, straight or branched C1-6 hydrocarbon chain;
Y3 is optionally substituted C1-20 aliphatic; and
—X2-X3 is
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