CAS No. 53123-88-9

Batch: Purity:99.63
Rapamycin (Sirolimus) Chemical Structure
Chemical Structure
Check the Rapamycin (Sirolimus) product page for in-depth specifications, including solubility, stock solutions, MOA, and working concentrations.

Chemical Information

IUPAC Name (1R,9S,12S,15R,16E,18R,19R,21R,23S,24E,26E,28E,30S,32S,35R)-1,18-dihydroxy-12-[(2R)-1-[(1S,3R,4R)-4-hydroxy-3-methoxycyclohexyl]propan-2-yl]-19,30-dimethoxy-15,17,21,23,29,35-hexamethyl-11,36-dioxa-4-azatricyclo[30.3.1.04,9]hexatriaconta-16,24,26,28-tetraene-2,3,10,14,20-pentone
CAS Number 53123-88-9
Molecular Formula

C51H79NO13

Molecular Weight (MW) 914.18
SMILES CC1CCC2CC(C(=CC=CC=CC(CC(C(=O)C(C(C(=CC(C(=O)CC(OC(=O)C3CCCCN3C(=O)C(=O)C1(O2)O)C(C)CC4CCC(C(C4)OC)O)C)C)O)OC)C)C)C)OC
InChIKey QFJCIRLUMZQUOT-HPLJOQBZSA-N

Ordering Information

Biological Activity

Rapamycin (Sirolimus) is a specific mTOR inhibitor that complexes with FKBP12 to allosterically inhibit the mTORC1 complex. Disruption of mTORC1 downstream signaling leads to the suppression of protein synthesis, cell cycle progression, and cellular proliferation while potently triggering autophagy. Furthermore, rapamycin inhibits interleukin-mediated hematopoietic bone marrow cell expansion and functions as an effective immunosuppressant that prevents graft rejection in allogeneic transplantation models. [1][2]

How to Prepare Stock Solution?

Concentration Volume Mass
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Solubility

Batch:
All in vitro solubility values are batch-tested experimental data (non-literature values).
Solvent Solubility & Note
DMSO 100 mg/mL (109.38 mM)
(Moisture-contaminated DMSO may reduce solubility. Use fresh, anhydrous DMSO. The recommended stock concentration is 10 mM in DMSO.)
Ethanol 25 mg/mL
Water Insoluble
FAQ
Q: Why does a DMSO stock precipitate in media/saline?
A: It is caused by unheated aqueous media (supersaturation), local solvent shock, or incorrect mixing sequence.
How to fix it?
  • Preheat media/saline to 37°C.
  • Mix rapidly (pipette/vortex) upon addition.
  • For complex mixes, always add the aqueous phase last.
  • Re-dissolve minor precipitates with a 37°C water bath and sonication (≤30 min).

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Note: Technical data last updated: Sep 1, 2026.