The invention provides a new oligopeptide linker intermediate and a preparation method thereof. The preparation method of the oligopeptide intermediate is easily carried out under mild reaction conditions, and since almost no side reactions occur in the reaction, the method produces a high-purity product with fewer impurities and easy to be purified, achieving unexpected technical effects.

Methods for making a dolastatin, auristatin or related compounds comprising the steps of providing a universal dolastatin core of Formula (I) reacting the C-terminal carboxylic acid group with an amine (A) to form an amide bond and reacting the N-terminal amine with a carboxylic acid (CA) to form an amide bond, wherein the steps can be performed in either order. Also provided are an isolated salt of the universal dolastatin core for use in preparation of dolastatins, auristatins and related compounds. Also provided are a number of intermediates and process steps which are useful for the preparation of high purity dolastatin core and high purity dolastatin and auristatin compounds.

The present invention provides a catalyst containing a Brønsted acid as a novel means capable of producing an amide compound by highly stereoselectively and/or highly efficiently causing an amidation reaction in a variety of substrates having a carboxylic ester group and an amino group.

Provided is a method of producing an antibody-drug conjugate represented by Formula I

##STR00001## in the formula, Ab is an antibody or an antigen-binding fragment thereof, D is eribulin, m is an integer of 1 to 10, and p is an integer of 1 to 8, the method comprising: a step 1 of obtaining a compound represented by Formula (B) by reaction of eribulin or a salt thereof with a compound represented by Formula (A),

##STR00002## in the formula, m is an integer of 1 to 10 and X is a phenoxy group or a nitrophenoxy group, and

##STR00003## in the formula, n is an integer of 1 to 10, and a step 2 of obtaining the antibody-drug conjugate represented by Formula (I) by reaction of the compound represented by Formula (B) with Ab.

The present application is directed to cargo delivery complexes for intracellular delivery of a cargo molecule comprising: a first peptide comprising a cell-penetrating peptide (CPP), a second peptide comprising a cell-penetrating peptide, and a cargo molecule. The second peptide comprises a polyethylene glycol (PEG) moiety linked to the second CPP, and the first peptide does not have a PEG moiety. The present application is also directed to a cargo delivery complex comprising a CPP and a cargo molecule wherein the CPP is a retro-inverso peptide. The present application is also directed to a cargo delivery complex comprising a CPP and a cargo molecule wherein the peptide further comprises a targeting sequence selected from the group consisting of GYVSK, GYVS, YIGS and YIGSR. Methods of making and using the cargo delivery complexes are also disclosed.

This invention is in the field of medicinal pharmacology. In particular, the present invention relates to pharmaceutical agents which function as inhibitors of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) viral replication and/or SARS-CoV-2 related viral 3CL protease (M.sup.pro) activity. The invention further relates to methods of treating and/or ameliorating symptoms related to conditions caused by the SARS-CoV-2 virus (e.g., COVID-19), comprising administering to a subject (e.g., a human patient) a composition comprising one or more pharmaceutical agents which function as inhibitors of SARS-CoV-2 viral replication and/or inhibitors of SARS-CoV-2 related M.sup.pro activity.

A compound is provided which has a structure I: A-B-C and a method for administering the compound is also provided for use in the prophylaxis and/or treatment of a viral infection, and in particular for preventing and/or inhibiting viral replication, in which A is a quinoline or quinoline-like group, B is a sole amino acid or a peptide or polypeptide having a given amino acid sequence, and C is an O-phenoxy group. According to one embodiment, the compound is a protease inhibitor such as a caspase inhibitor, and the inhibitor can be Q-VD-OPh (N-(2-(quinolyl)valylaspartyl-(2,6-difluorophenoxyl)methyl ketone), optionally in an O-methylated form. Antiviral compositions and kits are also provided.

In certain aspects, compounds and uses thereof are provided. In certain aspects, compound-conjugates and uses thereof are provided.

Anti-lymphoma plant virus particles are described. The anti-lymphoma plant virus particles include a filamentous or rod-shaped plant virus particle linked to an antimitotic agent. A therapeutically effective amount of an anti-lymphoma plant virus particle can be administered to a subject to provide a method of treating lymphoma.

Prodrugs of an NMDA antagonist, (S)-1-phenyl-2-(pyridin-2-yl)ethanamine, useful for the treatment of depression (particularly major depressive disorder) or pain; compositions comprising them, and methods of making them.