The present invention relates to novel cationic lipids, transfection agents, microparticles, nanoparticles, and short interfering nucleic acid (siNA) molecules. Specifically, the invention relates to novel cationic lipids, microparticles, nanoparticles and transfection agents that effectively transfect or deliver short interfering nucleic acid (siNA). The compositions described herein are generally referred to as formulated molecular compositions (FMC) or lipid nanoparticles (LNP).