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dlin mc3 dma


The ionizable cationic lipid DLin-MC3-DMA is an effective vector for siRNA delivery. DLin-MC3-DMA (MC3) was discovered by Thomas Madden and Michael Hope during their exploration of novel ionizable lipids. It was used as a key component in Onpattro, the first siRNA drug approved by the FDA in 2018 (Onpattro also marks the first-ever targeted RNA-based gene therapy administered via a non-viral vector). 


Product nameDLin-MC3-DMA
Chemical name(6Z,9Z,28Z,31Z)-heptatriacont-6,9,28,31-tetraene-19-yl 4-(dimethylamino)butanoate
CAS No.1224606-06-7
EINECS registration Number/
CDE Record registration Number/
FDA DMF Number/
Quality standardsmanufacturer's standard
Molecular formulaC43H79NO2
Content determination≧96%(CAD)
Molecular weight642.1
Product CodeO02006
Available Package Sizes1g


1. Low toxicity: DLin-MC3-DMA is a pH-responsive ionizable lipid, whereby it adopts a positive charge at low pH and has near-neutral charge at physiological pH. This means that, when forming lipid nanoparticles (LNPs) encapsulating nucleic acids under acidic conditions, it exhibits minimal positive charge density in the bloodstream, resulting in low cellular toxicity.

2. High efficiency: LNPs formed with DLin-MC3-DMA exhibit positive charge, facilitating lysosomal SiRNA escape to enhance transfection efficiency and reducing phagocytosis by macrophages.


DLin-MC3-DMA is a colorless to yellowish oily liquid with a pKa of 6.44. The functional activity of LNPs is correlated with the pKa value of the cationic lipid used. LNPs formed with DLin-MC3-DMA with a pKa of 6.2 to 6.5 exhibit higher gene-silencing activity.

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