CPC C07F 9/06 (2013.01) [A61K 47/545 (2017.08); C07C 205/59 (2013.01); C07C 235/34 (2013.01); C07D 403/14 (2013.01); C12N 15/113 (2013.01); C12N 2310/14 (2013.01); C12N 2310/351 (2013.01)] | 19 Claims |
1. A compound of Formula III,
![]() or a pharmaceutically acceptable salt thereof,
wherein,
L1, L2, and L3 are each linkers of the formula:
![]() L4 is selected from the group consisting of:
![]() wherein
![]() R4 is H or optionally substituted alkyl;
X is O or S; and
RNA comprises or consists of an RNAi agent.
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