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Enflurane (Efrane), a volatile anaesthetic, is a potent inhibitor of high conductance Ca2+-activated K+ channels of Chara australis. Enflurane is an internal standard in monitoring halogenated volatile anaesthetics by headspace gas chromatography-mass spectrometry. It allows rapid adjustments of anesthesia depth with little change in pulse or respiratory rate.

Bumetanide (PF 1593) is a potent sulfamoylanthranilic acid derivative belonging to the class of loop diuretics. In the brain, bumetanide may prevent seizures in neonates by blocking the bumetanide-sensitive sodium-potassium-chloride cotransporter (NKCC1), thereby inhibiting chloride uptake thus, decreasing the internal chloride concentration in neurons and may block the excitatory effect of GABA in neonates.

α-Amylase, a hydrolase enzyme, catalyzes the hydrolysis of internal α-1,4-glycosidic linkages in starch, producing glucose and maltose.

1,5,5-Trimethylhydantoin (TMH) serves as a non-isotopic internal standard (IS).

1,2-Distearoyl-sn-glycerol is an internal standard for the isolation and characterization of molecular species of 1,2-diacyl-sn-glycerol (DAG).

DTT (DL-Dithiothreitol) is a strong reducing agent. DTT has anti-disulfide ptosis activity and, upon oxidation, forms a stable six-membered ring with internal disulfide bonds.

2-Hydroxy-6-methoxybenzoic acid (6-Methoxysalicylic acid) may be employed as internal standard for the determination of acetylsalicylic acid (aspirin, ASA) and its major metabolite, salicylic acid (SA),and exhibits significant analgesic effects

2-Ethylbutyric acid is an internal standard that can be used in calibration methods for VFA analytical standards for feces.

1. Peimisine (Ebeiensine) can affect M-receptor, excit β-receptor, restrain the release of internal calcium, and promote to releaseing nitrogen monoxidum in order to relax tracheal smooth muscle and relieve asthma. 2. Peimisine can attenuate lung tissue injury( ALI), LDH and MDA amount in ALI mice in a dose dependent manner, it also lower the total protein, total white blood cells, lymphocyte and neutrophilic leukocyte in bronchoalveolar lavage fluid( BALF); suggests that peimisine can play a protective role against LPS-induced acute lung injury. 3. Peimisine has the protective effect on the experimental hepatic fibrosis formation, the possible mechanisms are associated with inhibiting fibrogenesis and fibrosis accumulation, and decreasing lipid peroxidation. 4. Peimisine can inhibit angiotensin I converting enzyme activity in a dose-dependent manner, displaying 5 % inhibitory concentration values of 526.5 microM, thus, it may have antihypertensive action.

N6-Methyladenosine is a methylated adenine residue, glycoside is an endogenous uridine product of transfer RNA degradation. It is the most prevalent internal modification of messenger RNA present in all higher eukaryotes and can modify viral RNA with antiviral activity.

HM43239 is an orally active and selective FLT3 inhibitor with IC 50 s of 1.1 nM, 1.8 nM and 1.0 nM for FLT3 WT, FLT3 internal tandem duplication (ITD) and FLT3 D835Y kinases, respectively. HM43239 directly inhibits the kinase activity of FLT3 as a reversible Type I inhibitor and effectively modulates downstream p-STAT5 and p-ERK. HM43239 also demonstrated inhibition of SYK, JAK1 2 and TAK1. HM43239 inhibits the proliferation and induces the apoptosis of leukemic cells [1] [2] [3].

Fexofenadine-d6 (MDL-16455-d6) is the deuterium substituent of Fexofenadine and can be used as an internal standard for the determination of non-sofenadine concentrations in human plasma.

PROTAC FLT-3 degrader 1 is a PROTAC FLT-3 degrader of internal tandem duplication (ITD) with an IC50 of 0.6 nM and exhibits anti-proliferative activity.

Iferanserin (S-MPEC) is a selective antagonist of the serotonin (5-HT) receptor with a specific affinity for 5-HT2A receptors, showing potential for the treatment of internal hemorrhoid disease.

DPQ is an antiviral compound. DPQ has also been shown to bind to a widened RNA major groove at the internal loop. DPQ acts against the H1N1 and H3N2 strains of influenza A as well as influenza B.

Boc-Pro-OMe (Boc-L-proline methyl ester) is a lipid compound utilized in liposome preparation. Liposomes consist of concentric phospholipid bilayer vesicles, which serve as vital components in constructing drug delivery systems for anticancer and anti-infection applications. These systems effectively encapsulate high-polarity water-soluble payloads within the internal aqueous space of the liposome, while lipophilic payloads are integrated into and become part of the lipid bilayer. This compound is particularly effective for delivering antisense oligonucleotides, addressing issues of low cellular uptake and rapid bodily excretion.

1-Stearoyl-2-docosahexaenoyl-sn-glycero-3-phosphoethanolamine (18:0-22:6 PE) is a lipid compound utilized in the preparation of liposomes. Liposomes, forming the central component of concentric phospholipid bilayer vesicles, are pivotal in constructing drug delivery systems for anti-cancer and anti-infection applications. They effectively encapsulate hydrophilic payloads within their aqueous internal spaces, while lipophilic compounds are integrated into and become part of the lipid bilayer. This compound is particularly effective for delivering antisense oligonucleotides, addressing challenges such as inefficient cellular uptake and rapid loss in the body.

NH2-GG-DSPE is a lipid compound utilized in liposome formulation. Liposomes, having concentric phospholipid bilayer vesicles, are crucial components in constructing drug delivery systems for anti-cancer and anti-infection applications. This compound enables the encapsulation of highly polar water-soluble cargoes within the internal aqueous spaces of liposomes, while lipophilic cargoes can integrate into and become part of the lipid bilayers. NH2-GG-DSPE is particularly effective for delivering antisense oligonucleotides, overcoming challenges such as inefficient cellular uptake and rapid loss in the body.

N-Butyl stearate (NSC-4820，Stearic acid butyl ester) is an oily organic reagent that is an excellent PVC internal lubricant for organic synthesis.

LENNOXAMINE is an alkaloid synthesized through an intramolecular addition of an aryl radical to (trimethylsilyl)acetylene, resulting in a ten-membered lactone, followed by internal cyclization. This process involves a molecular structural transformation from the ten-membered lactone to LENNOXAMINE.

FLT3-IN-28 (Compound 12y) is an orally active FLT3 inhibitor with antitumor properties. It selectively targets cancer cells with FLT3 internal tandem duplication (ITD) mutations, demonstrating IC50 values of 85, 290, 130, 65, and 220 nM against BaF3-FLT3-ITD, BaF3-TEL-VEGFR2, MV4-11, MOLM-13, and MOLM-14 cell lines, respectively. These lines include acute myeloid leukemia (AML) cells harboring FLT3-ITD mutations such as MV4-11 and MOLM-13 14. The compound also reduces phosphorylation levels of FLT3 and STAT5 in MOLM-13 cells, leading to cell cycle arrest and apoptosis. With an oral bioavailability of 19.2% in SD rats, FLT3-IN-28 extends survival in a dose-dependent manner in MOLM-13 xenografted NSG mouse models. It holds promise for research in FLT3-ITD-related cancer studies.

EV-A71-IN-3 (Compound IRE-03-3) is an inhibitor of the enterovirus A71 (EV-A71). It targets the internal ribosome entry site (IRES) of EV-A71, blocking IRES-mediated translation and thereby preventing viral proliferation, with an EC50 of 11.96 μM.

Ebio3 is a selective potassium ion channel (KCNQ2) inhibitor with an IC50 of 1.2 nM. It binds to the KCNQ2 channel via its hydrophobic tail, causing the inward movement of the S6 helix, which results in the closure of the internal gate. The inhibitory effect of Ebio3 is equally effective on pathogenic KCNQ2 mutants, such as R75C and I238L, reducing their outward current by approximately 80%. Ebio3 holds potential for research in neurological disorders like epilepsy.

5-Methyl-2-Hexanol is a non-crystallizable secondary alcohol used as an internal standard for ultrasonic-assisted extraction of aroma compounds from grape brandies and aqueous-alcoholic wood extracts.