(R)-Azelastine hydrochloride is an antihistamine which has been shown to down-regulate H1R, M1R and M3R levels. This compound has also been shown to inhibit HNEpC proliferation.

(S)-Azelastine hydrochloride is an antihistamine which has been shown to down-regulate H1R, M1R and M3R levels. This compound has also been shown to inhibit HNEpC proliferation.

Antazoline phosphate is an antihistamine with anticholinergic properties used to relieve nasal congestion and the symptoms of allergic conjunctivitis. Antazoline is an ethylenediamine derivative with histamine H1 antagonistic and sedative properties. Antazoline antagonizes histamine H1 receptor and prevents the typical allergic symptoms caused by histamine activities on capillaries, skin, mucous membranes, and gastrointestinal and bronchial smooth muscles.

S-acetyl-PEG3-alcohol is a PEG Linker.

Lipoamido-PEG2-alcohol is a PEG Linker.

Tetrazine-PEG5-NHS ester is a PEG derivative containing a tetrazine group and an NHS ester. The hydrophilic PEG spacer increases water-solubility. It is one of the most reactive tetrazines commercially available. Hydrogen substituted tetrazines demonstrate exceptionally fast kinetics compared to methyl substituted tetrazines.

Methyltetrazine-NHS ester is an NHS actived building block containing a methyltetrazine group. It can react with primary amines such as the side chain of lysine residues or aminosilane-coated surfaces at neutral or slightly basic pH to form covalent bonds. Thus, this reagent can be used for modification of amine-containing molecule in organic media and the low mass weight will add minimal spacer to modified molecules.

Tetrazine-NHS ester is an NHS activated tetrazine derivative. The chemical stability of tetrazines is lower than methyltetrazines, but it is in acceptable range and thus can be applied for many applications. This reagent was found the fastest kinetics for bioorthogonal reaction with trans-cyclooctene (TCO) as the dienophile.

TCO-amine hydrochloride is a simple building block containing a TCO moiety and a free amine. This reagent can be used to derivatize carboxyl groups or activated esters (e.g. NHS esters) with the TCO moiety through a stable amide bond in the presence of of activators (e.g. EDC, or DCC). The low mass weight will add minimal spacer to modified molecules.

TCO-PEG4-NHS ester is a PEG derivative containing a TCO moiety and a NHS ester. The hydrophilic PEG spacer increases water solubility and decreases steric hindrance during ligation. This reagent can be used to label antibodies, proteins, and other primary amine-containing macromolecules with TCO moiety.

Azido-PEG4-tetra-Ac-beta-D-glucose is a PEG derivative containing one azide group and one D-glucose group. The azide group enables Click Chemistry. The hydrophilic PEG spacer increases solubility in aqueous media. D-glucose increases solubility in aqueous media and increases the selectivity of the PEGylation reaction.

Azido-PEG4-alpha-D- mannose is a PEG Linker.

Azido-PEG4-beta-D-glucose is a PEG derivative containing one azide group and one D-glucose group. The azide group enables Click Chemistry. The hydrophilic PEG spacer increases solubility in aqueous media. D-glucose increases solubility in aqueous media and increases the selectivity of the PEGylation reaction.

Tos-PEG4-CH2CO2H is a PEG derivative containing a tosyl group and a terminal carboxylic acid. The hydrophilic PEG spacer increases solubility in aqueous media. The tosyl group is a very good leaving group for nucleophilic substitution reactions. The terminal carboxylic acid can be reacted with primary amine groups in the presence of activators (e.g. EDC, or DCC) to form a stable amide bond.

Tos-PEG7-CH2CO2tBu is a PEG derivative containing a t-butyl ester and a tosyl group. The hydrophilic PEG spacer increases solubility in aqueous media. The t-butyl protected carboxyl group can be deprotected under acidic conditions. The tosyl group is a very good leaving group for nucleophilic substitution reactions.

Tos-PEG5-CH2CO2tBu is a PEG derivative containing a t-butyl ester and a tosyl group. The hydrophilic PEG spacer increases solubility in aqueous media. The t-butyl protected carboxyl group can be deprotected under acidic conditions. The tosyl group is a very good leaving group for nucleophilic substitution reactions.

Tos-PEG2-CH2CO2tBu is a PEG derivative containing a t-butyl ester and a tosyl group. The hydrophilic PEG spacer increases solubility in aqueous media. The t-butyl protected carboxyl group can be deprotected under acidic conditions. The tosyl group is a very good leaving group for nucleophilic substitution reactions.

Propargyl-PEG3-phosphonic acid is a crosslinker containing a propargyl group and a phosphonic acid. The propargyl group can be reacted with azide-bearing compounds or biomolecules via copper catalyzed azide-alkyne Click Chemistry to yield a stable triazole linkage. The hydrophilic PEG spacer increases solubility in aqueous media.

t-butyoxycarboxy-PEG4-phosphonic acid ethyl ester is a PEG Linker.

Carboxy-PEG4-phosphonic acid is a PEG Linker.

PEG3-bis-(ethyl phosphonate) is a PEG Linker.

Mal-PEG6-PFP is a PEG Linker.

Mal-PEG6-NHS ester is a PEG derivative containing a maleimide group and an NHS ester group. The hydrophilic PEG spacer increases solubility in aqueous media. The NHS ester can be used to label the primary amines (-NH2) of proteins, amine-modified oligonucleotides, and other amine-containing molecules. The maleimide group will react with a thiol group to form a covalent bond, enabling the connection of biomolecule with a thiol.

Mal-PEG3-NHS ester is a PEG derivative containing a maleimide group and an NHS ester group. The hydrophilic PEG spacer increases solubility in aqueous media. The NHS ester can be used to label the primary amines (-NH2) of proteins, amine-modified oligonucleotides, and other amine-containing molecules. The maleimide group will react with a thiol group to form a covalent bond, enabling the connection of biomolecule with a thiol.

Azide-PEG4-Tos is a PEG derivative containing an azide group and a tosyl group. The hydrophilic PEG spacer increases solubility in aqueous media. The azide group can react with alkyne, BCN, DBCO via Click Chemistry to yield a stable triazole linkage. The tosyl group is a good leaving group for nucleophilic substitution reactions.

Azido-PEG8-t-butyl ester is a PEG derivative containing an azide group and a t-butyl ester. The hydrophilic PEG spacer increases solubility in aqueous media. The azide group can react with alkyne, BCN, DBCO via Click Chemistry to yield a stable triazole linkage. The t-butyl protected carboxyl group can be deprotected under acidic conditions.

m-PEG4-benzaldehyde is a PEG Linker. PEG Linkers and derivatives may be useful in the development of antibody drug conjugates.

Azido-PEG10-acid is a PEG derivative containing an azide group with a terminal carboxylic acid. The hydrophilic PEG spacer increases solubility in aqueous media. The azide group can react with alkyne, BCN, DBCO via Click Chemistry to yield a stable triazole linkage. The terminal carboxylic acid can be reacted with primary amine groups in the presence of activators (e.g. EDC, or DCC) to form a stable amide bond.

4-amino-N-(4-(2-cyanoethynyl)phenyl)butanamide is part of a new class of thiol-specific conjugation reagents consisting of a thiol-reactive 3-arylpropiolonitrile (APN) group. The APN group allows the targeted coupling of thiols in biomolecules, and results in stable thioether linkages without the risk of subsequent side reactions that can occur with maleimides.

tert-butyl 3-(4-(2-cyanoethynyl)phenylcarbamoyl)propylcarbamate is part of a new class of thiol-specific conjugation reagents consisting of a thiol-reactive 3-arylpropiolonitrile (APN) group. The APN group allows the targeted coupling of thiols in biomolecules, and results in stable thioether linkages without the risk of subsequent side reactions that can occur with maleimides.