The present invention provides cationic lipids and lipid nanoparticle formulations comprising these lipids, alone or in combination with other lipids. These lipid nanoparticles may be formulated with nucleic acids to facilitate their intracellular delivery both in vitro and for therapeutic applications. The present invention also provides methods of chemical synthesis of these lipids, lipid nanoparticle preparation and formulation with nucleic acids.

In one aspect, the invention relates to compounds having the formula:

##STR00001##

where R.sup.1-R.sup.6, a, b, and Z are as defined in the specification, or a pharmaceutically acceptable salt thereof. These compounds have neprilysin inhibition activity. In another aspect, the invention relates to pharmaceutical compositions comprising such compounds; methods of using such compounds; and processes and intermediates for preparing such compounds.

In one aspect, the invention relates to compounds having the formula:

##STR00001##

where R.sup.1-R.sup.6, a, b, and Z are as defined in the specification, or a pharmaceutically acceptable salt thereof. These compounds have neprilysin inhibition activity. In another aspect, the invention relates to pharmaceutical compositions comprising such compounds; methods of using such compounds; and processes and intermediates for preparing such compounds.

The present invention relates to novel disulfur bridge linkers containing hydrazine used for the specific conjugation of compounds/cytotoxic agents to a cell-binding molecule, through bridge linking a pair of thiols on the cell-binding molecule. The invention also relates to methods of making such linkers, and of using such linkers in making homogeneous conjugates, as well as of application of the conjugates in treatment of cancers, infections and autoimmune disorders.

The present invention relates to novel disulfur bridge linkers containing hydrazine used for the specific conjugation of compounds/cytotoxic agents to a cell-binding molecule, through bridge linking a pair of thiols on the cell-binding molecule. The invention also relates to methods of making such linkers, and of using such linkers in making homogeneous conjugates, as well as of application of the conjugates in treatment of cancers, infections and autoimmune disorders.

Compounds, compositions and methods for the treatment of retinal degenerative diseases, such as retinitis pigmentosa, Leber's congenital Amaurosis, Syndromic retinal degenerations, age-related macular degeneration and Usher Syndrome, and hearing loss associated with Usher Syndrome are described herein.

The present invention provides, among others, compounds of Formula (I) or a salt thereof, methods for making these compounds, degradable polymers and reinforced composites made therefrom, and methods for degrading and/or recycling the degradable polymers and reinforced composites. ##STR00001##

The present invention provides, among others, compounds of Formula (I) or a salt thereof, methods for making these compounds, degradable polymers and reinforced composites made therefrom, and methods for degrading and/or recycling the degradable polymers and reinforced composites. ##STR00001##

The present invention relates to novel disulfur bridge linkers containing hydrazine used for the specific conjugation of compounds/cytotoxic agents to a cell-binding molecule, through bridge linking a pair of thiols on the cell-binding molecule. The invention also relates to methods of making such linkers, and of using such linkers in making homogeneous conjugates, as well as of application of the conjugates in treatment of cancers, infections and autoimmune disorders.

The present invention relates to novel disulfur bridge linkers containing hydrazine used for the specific conjugation of compounds/cytotoxic agents to a cell-binding molecule, through bridge linking a pair of thiols on the cell-binding molecule. The invention also relates to methods of making such linkers, and of using such linkers in making homogeneous conjugates, as well as of application of the conjugates in treatment of cancers, infections and autoimmune disorders.