Molecular Weight: 695.75 g/mol

Rifamycin S Chemical Structure
Chemical Structure
Check the Rifamycin S product page for in-depth specifications, including solubility, stock solutions, MOA, and working concentrations.

How to Prepare Stock Solution?

Concentration Volume Mass
🧮 Molarity Calculator

Solubility

Batch:
All in vitro solubility values are batch-tested experimental data (non-literature values).
Solvent Solubility & Note
DMSO 100 mg/mL (143.72 mM)
(Moisture-contaminated DMSO may reduce solubility. Use fresh, anhydrous DMSO. The recommended stock concentration is 10 mM in DMSO.)
Ethanol 100 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).

Chemical Information

IUPAC Name [(7S,9E,11S,12R,13S,14R,15R,16R,17S,18S,19E,21Z)-2,15,17-trihydroxy-11-methoxy-3,7,12,14,16,18,22-heptamethyl-6,23,27,29-tetraoxo-8,30-dioxa-24-azatetracyclo[23.3.1.14,7.05,28]triaconta-1(28),2,4,9,19,21,25-heptaen-13-yl] acetate
CAS Number 13553-79-2
Molecular Formula

C37H45NO12
Molecular Weight (MW) 695.75
SMILES COC1\C=C\OC2(C)OC3=C(C2=O)C4=C(C(=C3C)O)C(=O)C(=CC4=O)NC(=O)\C(=C/C=C/C(C)C(O)C(C)C(O)C(C)C(OC(C)=O)C1C)C
InChIKey BTVYFIMKUHNOBZ-ODRIEIDWSA-N

Jump to

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