abstract |
Compounds are provided having the following structure: n nor a pharmaceutically acceptable salt, tautomer or stereoisomer thereof, wherein R 1a , R 1b , R 2a , R 2b , R 3a , R 3b , R 4a , R 4b , R 5 , R 6 , R 7 , R 8 , R 9 , L 1 , L 2 , G 1 , G 2 , G 3 , a, b, c and d are as defined herein. Use of the compounds as a component of lipid nanoparticle formulations for delivery of a therapeutic agent, compositions comprising the compounds and methods for their use and preparation are also provided. |