H3B-6545

H3B-6545 is an oral, selective estrogen receptor covalent antagonist (SERCA) for the research of metastatic ER-positive, HER2-negative breast cancer.

Product information

CAS Number: 2052130-80-8

Molecular Weight: 567.58

Formula: C30H29F4N5O2

Chemical Name: (2E)-N,N-dimethyl-4-{[2-({5-[(1Z)-4,4,4-trifluoro-1-(3-fluoro-2H-indazol-5-yl)-2-phenylbut-1-en-1-yl]pyridin-2-yl}oxy)ethyl]amino}but-2-enamide

Smiles: CN(C)C(=O)/C=C/CNCCOC1=CC=C(C=N1)/C(=C(/CC(F)(F)F)\C1C=CC=CC=1)/C1=CC2C(C=C1)=NNC=2F

InChiKey: JPFTZIJTXCHJNE-HMOQVRKWSA-N

InChi: InChI=1S/C30H29F4N5O2/c1-39(2)27(40)9-6-14-35-15-16-41-26-13-11-22(19-36-26)28(21-10-12-25-23(17-21)29(31)38-37-25)24(18-30(32,33)34)20-7-4-3-5-8-20/h3-13,17,19,35H,14-16,18H2,1-2H3,(H,37,38)/b9-6+,28-24-

Technical Data

Appearance: Solid Power

Purity: ≥98% (or refer to the Certificate of Analysis)

Solubility: DMSO : 250 mg/mL (440.47 mM; Need ultrasonic).

Shipping Condition: Shipped under ambient temperature as non-hazardous chemical or refer to Certificate of Analysis

Storage Condition: Dry, dark and -20 ^oC for 1 year or refer to the Certificate of Analysis.

Shelf Life: ≥12 months if stored properly.

Stock Solution Storage: 0 - 4 ^oC for 1 month or refer to the Certificate of Analysis.

Drug Formulation: To be determined

HS Tariff Code: 382200

How to use

In Vitro:

H3B-6545 is a highly selective small molecule that potently antagonizes wild-type and mutant ERα in biochemical and cell based assays. In vitro comparisons with standard of care and other experimental agents confirm increased cell potency of H3B-6545 under continuous as well as washout treatment conditions. H3B-6545, a member of a novel class of ERα antagonists refer to as selective ER covalent antagonist (SERCA), which inactivates both wild-type and mutant ERα by targeting C530 and enforcing a unique antagonist conformation. H3B-6545 is a first-in-class selective ER covalent antagonist (SERCA). H3B-6545 inhibits ERαWT activity and growth of ERαWT -positive breast cancer lines. H3B-6545 potently inhibits ERαWT activity and suppresses proliferation of ERαWT -positive breast cancer lines. With GI50s of 0.3-0.4, 1.0, 0.5, 5.2, and 0.2 nM for MCF7, HCC1428, BT483, T47D and CAMA-1 cell lines.

In Vivo:

In vivo, once daily oral dosing of H3B-6545 shows potent activity and superior efficacy to fulvestrant in the MCF-7 xenograft model with maximal antitumor activity at doses >10x below the maximum tolerated dose in mice. In addition, H3B-6545 shows superior antitumor activity to Tamoxifen and Fulvestrant in patient derived xenograft models of estrogen receptor positive breast cancer including models carrying ERα mutations in rat and monkeys, H3B-6545 is well tolerated across a broad dose range and at exposures that significantly exceed those required for efficacy in mouse xenograft models.

Products are for research use only. Not for human use.