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Gefitinib (ZD1839) is an EGFR first-generation inhibitor with oral activity that inhibits the EGFR 19 Del and L858R mutations. Gefitinib has antitumor activity and is used for the treatment of EGFR-mutated non-small-cell lung cancers. Gefitinib administration RESULTS in the development of the EGFR C797S resistance mutation.

Firibastat (RB150) is a glutamyl aminopeptidase antagonist and an orally active brain penetrating prodrug of EC33. It is a first-in-class brain aminopeptidase A (APA) inhibitor with a Ki of 200 nM. Firibastat selectively and specifically inhibits conversion of brain angiotensin-II into angiotensin-III and decreases blood pressure in hypertensive rats[1][2].

Astragaloside IV (AS-IV), an active component isolated from Astragalus membranaceus, suppresses the activation of ERK1 2 and JNK, and downregulates matrix metalloproteases (MMP)-2, (MMP)-9 in MDA-MB-231 breast cancer cells. Astragaloside IV is a bioactive saponin first isolated from the dried plant roots of the genus Astragalus, which is used in traditional Chinese medicine.1 It dose-dependently inhibits human adenovirus type 3 (HAdV-3) in A549 cells (IC50 = 23 μM; LC50 = 865 μM).It inhibits replication of HAdV-3 and decreases HAdV-3-induced apoptosis. It has diverse protective effects for the cardiovascular, immune, digestive, and nervous systems. In particular, it reduces myocardial infarct size in dogs when administered prior to coronary ligation and reduces reperfusion arrhythmias in isolated rat hearts.

AZD0780 (EX-A6975) is an oral small molecule PCSK9 inhibitor being developed by AstraZeneca as a first-in-class treatment for patients with dyslipidemia that is uncontrolled with statins alone.

Adalimumab (anti-TNF-alpha) is the first fully human recombinant IgG1 monoclonal antibody that specifically targets human TNF-alpha.

Pembrolizumab (MK-3475) is a highly selective humanized monoclonal antibody that antagonizes PD-1. It can block the PD-1 protein on T cells and prevent their interaction with PD-L1 on cancer cells.

MBC-11 is a first-in-class conjugate of the bone-targeting bisphosphonate etidronate covalently linked to the antimetabolite cytarabine (araC), with potential to treat tumor-induced bone disease (TIBD).

ProTAME is an inhibitor of APC/CFzr and APC/CCdc20. Combinations of proTAME with topoisomerase inhibitors, doxorubicin and etoposide, significantly increase cell death in primary cells and Multiple Myeloma (MM) cell lines, particularly if TOPIIα levels are first increased through pre-treatment with ProTAME.This compound is unstable in powder form and other related salt forms are recommended.

Ralaniten triacetate (EPI-506), a precursor of Ralaniten, is a first-of-its-kind, orally active androgen receptor N-terminal structural domain (AR-NTD) inhibitor with anticancer activity and can be used to study prostate and breast cancer.

DL-Xylose ((±)-Xylos) is a sugar first derived from wood. DL-Xylose is classified as a monosaccharide of the aldopentose type.

Chlorprothixene (Truxal) is a typical antipsychotic drug of the thioxanthene class, which was the first of the series to be synthesized.

Antazoline hydrochloride (Phenazoline hydrochloride), a first-generation antihistamine, can bind to the histamine H1 receptor and block the action of endogenous histamine.

Cephalonium (Cefalonium) is a first-generation cephalosporin antibiotic.

Pheniramine maleate (Trimetose), an alkylamine derivative with antihistaminic and vasodilatory properties, binds to histamine H1 receptors, thereby inhibiting phospholipase A2 and production of the endothelium-derived relaxing factor, nitric oxide.

Gliquidone (AR-DF 26) is a potent, second-generation sulfonylurea with antihyperglycemic activity, exhibiting greater binding affinity to SUR1 and increased potency compared to first-generation compounds. Additionally, this agent exerts peroxisome proliferator-activated receptor (PPAR) gamma agonistic activity.

Erlotinib (NSC-718781) is an EGFR inhibitor (IC50: 2 nM). It is used for the treatment of non-small cell lung cancer.

Linezolid (PNU-100766), the first of the oxazolidinone class, is a synthetic antibiotic used for the therapy of infections resulted from multi-resistant bacteria including methicillin-resistant Staphylococcus aureus (MRSA) and streptococcus. The drug takes effect as the inhibitor of the initiation of bacterial protein synthesis.

Promethazine hydrochloride (Promethazine HCl) , the first-generation antihistamine, is a strong antagonist of the H1 receptor and a moderate antagonist of the mACh receptor, moderate affinity for 5-HT2A, 5-HT2C, D2 and α1-adrenergic receptors.

Fluoxetine hydrochloride (Lilly110140) is the first highly specific serotonin uptake inhibitor. It is used as an antidepressant and often has a more acceptable side-effects profile than traditional antidepressants.

Mevastatin (ML236B) is an HMG-CoA reductase inhibitor that was initially isolated from the mold Pythium ultimum. Mevastatin was the first statin to enter clinical trials.

Cefazolin sodium (cephazolin sodium) salt binds to and inactivates penicillin-binding proteins (PBP) located on the inner membrane of the bacterial cell wall. Cefazolin sodium salt is the sodium salt of cefazolin, a beta-lactam antibiotic and first-generation cephalosporin with bactericidal activity. Inactivation of PBPs interferes with the cross-linkage of peptidoglycan chains necessary for bacterial cell wall strength and rigidity, which results in the weakening of the bacterial cell wall and cell lysis.

Trimetazidine dihydrochloride (Vastarel F) can improve myocardial glucose utilization by inhibiting fatty acid metabolism. Trimetazidine is the first cytoprotective anti-ischemic agent, also used as a vasodilator in ischemic heart disease or angina.

6-Benzylaminopurine (6-BAP), benzyl adenine or BAP is a first-generation synthetic cytokinin that elicits plant growth and development responses, setting blossoms and stimulating fruit richness by stimulating cell division. It is an inhibitor of respiratory kinase in plants, and increases post-harvest life of green vegetables.

Cephalothin sodium (Cefalotin) binds to and inactivates penicillin-binding proteins (PBP) located on the inner membrane of the bacterial cell wall. Cephalothin sodium (Cefalotin) is the sodium salt form of cephalothin, a semisynthetic, beta-lactam, the first-generation cephalosporin antibiotic with bactericidal activity. PBPs participate in the terminal stages of assembling the bacterial cell wall, and in reshaping the cell wall during cell division. Inactivation of PBPs interferes with the cross-linkage of peptidoglycan chains necessary for bacterial cell wall strength and rigidity. This results in the weakening of the bacterial cell wall and causes cell lysis.