b 4

Otophylloside B 4'''-O-alpha-L-cymaropyranoside是一种天然的孕烷苷，可用于生命科学领域的相关研究。

Otophylloside B 4'''-O-beta-D-cymaropyranoside是一种天然的孕烷苷，能够以微摩尔浓度级别抑制HepG2，Hela，U251等癌细胞生长(IC50=31.24~38.91μM)，具有细胞毒性和抗癌潜力。

Leukotriene B4 (LTB4) 是一种通过 5-脂氧合酶途径从花生四烯酸衍生而来的化合物，可介导某些炎症和免疫反应。Leukotriene B4 诱导中性粒细胞胞外陷阱阻碍肺孢子菌的清除。

A12B4C3 is a selective inhibitor of hPNKP phosphatase.

12-oxo Leukotriene B4 (12-Oxo-LTB4)是一种强效促炎脂质介质，属于通过5-脂氧合酶（5-LO）途径从花生四烯酸代谢酶解产生的二羟基脂肪酸。它能促进多种白细胞功能反应，包括细胞聚集、跨膜离子流刺激、溶酶体酶释放增强、超氧阴离子生成。12-oxo Leukotriene B4是LTB4经LTB4 12-羟基脱氢酶途径形成的初始氧化代谢物，该代谢物先经酶促快速转化为10,11-二氢-12-氧代-LTB4，再通过12-氧代基团还原生成10,11-二氢-LTB4。

Leukotriene B4 (LTB4) is a dihydroxy fatty acid derived from arachidonic acid through the 5-lipoxygenase pathway. It promotes a number of leukocyte functions including aggregation, stimulation of ion fluxes, enhancement of lysosomal enzyme release, superoxide anion production, chemotaxis, and chemokinesis. At least two LTB4 receptors, termed BLT1 and BLT2, have been identified. 14,15-dehydro LTB4 is a LTB4 receptor antagonist that has a higher binding affinity for BLT1, demonstrating a Ki value of 27 nM, compared to BLT2, which has a Ki value of 473 nM. 14,15-dehydro LTB4 inhibits LTB4-induced release of lysozymes from rat polymorphonuclear leukoctyes with an IC50 value of 1 μM.

Lipoxin B4是花生四烯酸的代谢产物，能够抑制上呼吸道中的鼻粘膜中的白细胞浸润和粘液分泌，具有粘膜保护作用，常用于研究上、下呼吸道的过敏性炎症。

LTB4 dimethyl amide is a moderate inhibitor of LTB4-induced degranulation of human neutrophils (Ki = 130 nM) and lysozyme release from rat PMNL. LTB4 dimethyl amide appears to be an antagonist of the LTB4 receptor on guinea pig lung membranes.

The effects of Leukotriene B4 (LTB4) are mediated by two known receptors, BLT1 and BLT2. LTB4 is a high affinity ligand for BLT1, and many of its pro-inflammatory effects are believed to be transduced through this receptor. The BLT2 is more enigmatic, in that LTB4 is not a high-affinity ligand, nor is it clear that BLT2 activation promotes inflammation. LTB4 ethanolamide (LTB4-EA) is a theoretical 5-LO metabolite of arachidonoyl ethanolamide (AEA). In CHO cells transfected with human BLTR1, LTB4-EA was a potent antagonist with about three times greater affinity for the receptor than LTB4 (Ki = 1.22 nM versus 3.88 nM). LTB4-EA antagonizes the LTB4-induced contractions of guinea pig lung parenchyma with an EC50 of 10 nM. LTB4-EA thus represents a potential endogenous anti-inflammatory compound functioning as a natural antagonist of BLTR1.

Leukotriene B4 (LTB4) compounds are produced by both enzymatic and non-enzymatic processes. The products of enzymatic origin, via Leukotriene A4 (LTA4) hydrolase, are stereospecifically 12(R). Non-enzymatic hydrolysis products are 50:50 mixtures at C-12, but are almost exclusively trans at C-6. Thus, the non-enzymatic hydrolysis product of LTA4 is 6-trans-12-epi LTB4. 12-epi LTB4 is an isomer which would not be expected to occur in either non-enzymatic hydrolysis products, or in the enzymatic products of LTA4 hydrolase. Compared to LTB4, 12-epi LTB4 has significantly reduced activity for the LTB4 receptor on human neutrophils (IC50 of 7.5 mM), and on guinea pig lung membranes with a (Ki of 4.7 mM). 12-epi LTB4 is an weak agonist at both the recombinant human BLT1 and BLT2 receptors, requiring approximately 10 mM for full activation of the receptor.

20-hydroxy LTB4 is a metabolite of LTB4 in human neutrophils. In human leukocytes, LTB4 is inactivated by the enzyme LTB4 20-hydroxylase. 20-hydroxy LTB4 is not only much less active (~5%) compared to LTB4 in causing degranulation of PMNL, but actually inhibits LTB4-induced degranulation of human neutrophils (Ki = 13.3 nM). However, 20-hydroxy LTB4 is as active as LTB4 in contracting parenchymal strips from guinea pig lung. 20-hydroxy LTB4 retains considerable ligand binding affinity at the BLT2 receptor, but does not appear to function as an agonist.

Lipoxin B4 (LXB4) methyl ester is a lipid soluble prodrug form of the transcellular metabolite LXB4 . LXB4 is a positional isomer of LXA4 produced by the metabolism of 15-HETE or 15-HpETE by human leukocytes. At a concentration of 100 nM, LXB4 inhibits polymorphonuclear leukocyte (PMN) migration stimulated by leukotriene B4 and inhibits LTB4-induced adhesion of PMNs with an IC50 value of 0.3 nM.

Pulchinenoside C (Anemoside B4) 是一种从 P. chinensis 中分离出来的丰富的三萜皂苷，具有抗炎和抗氧化作用。

Saikosaponin B4 是一种柴胡皂苷，分离自柴胡的根。Saikosaponin B4选择性地抑制 ACTH 诱导的脂解作用。

Procyanidin B4 reveals significant antioxidant activity

Calystegine B4 是一种有用的有机化合物，可用于生命科学领域的相关研究，其产品编号为 T125519。

Malformin-B4 是一种有用的有机化合物，可用于生命科学领域的相关研究。其产品编号为 T125793，CAS号为 149596-55-4。

6-trans-12-epi-Leukotriene B4 是一种花生四烯酸代谢物，是一种有效的抗炎剂。

Bleomycin B4 (Phleomycin F)，一种具有抗肿瘤活性的抗生素，常用于癌症研究。

20-Carboxy-Leukotriene B4 (20-COOH LTB4) 是 Leukotriene B4 (LTB4) 的代谢物。20-Carboxy-Leukotriene B4 以高亲和力与 BLT1 受体结合。20-Carboxy-Leukotriene B4 抑制 LTB4 介导的中性粒细胞反应，迁移、脱粒、白三烯生物合成。

Fumonisin B4，作为一种伏马菌素衍生物，展现出较低的白蛋白结合能力。

Dermaseptin-B4为来源于南美洲树蛙Phyllomedusa bicolor皮肤分泌物的一种抗菌肽。

Leukotriene B4 (LTB4)-3-aminopropylamide is an analog of LTB4 that exhibits potent and selective binding to the BLT1 receptor with Ki values of 5.1 nM at BLT1 and 1,227 nM at BLT2, indicating its high affinity for BLT1 over BLT2. This compound's effects are mediated through interactions with two receptors, BLT1 and BLT2.

18-Carboxy dinor Leukotriene B4 (18-carboxy dinor LTB4) represents a β-oxidation metabolite of Leukotriene B4 (LTB4). Initially, LTB4 is metabolized in the liver to 20-carboxy LTB4, which subsequently undergoes β-oxidation to form 18-carboxy dinor LTB4.