Suzhou Pharmaceutical Technology Co., Ltd. (China) supplies Sirolimus API CAS 53123-88-9 for pharmaceutical B2B procurement — COA, MSDS, and technical documentation available on request.
> Sirolimus API — Overview
Sirolimus (CAS: 53123-88-9, also known as rapamycin, sirolimus API, AY-22989, RAPA, and macrolide mTOR inhibitor API) is a high-value macrolide API used in formulation, analytical-development, and research programs where local regulations permit. Suzhou Pharmaceutical Technology Co., Ltd. supplies Sirolimus API in controlled small-batch and bulk quantities from Suzhou, China, with export to South America, Australia, New Zealand, Mexico, Canada, and worldwide markets. Export documentation: COA and MSDS standard for all orders.
| Product Name | Sirolimus (Rapamycin) |
| Structural Formula |  |
| Alias | Rapamycin; Sirolimus API; AY-22989; RAPA; macrolide mTOR inhibitor API |
| CAS Number | 53123-88-9 |
| Molecular Formula | C51H79NO13 |
| Molecular Weight | 914.2 g/mol |
| Purity | Available by agreed HPLC specification |
| Appearance | White to off-white powder |
| Storage | Store sealed at controlled low temperature, protected from moisture and strong light |
> Applications
Sirolimus is used by pharmaceutical and research organizations developing macrolide mTOR-inhibitor formulations, reference methods, and impurity-control strategies. API supply is intended for qualified buyers who will confirm dosage form, solid-state and impurity strategy, impurity requirements, pharmacopoeial approach, and finished-product registration obligations in their own markets.
mTOR-inhibitor formulation research
A 2021 Pharmaceutics review discussed sirolimus delivery systems and analytical challenges relevant to formulation development and quality control for low-solubility macrolide APIs (Pharmaceutics, doi:10.3390/pharmaceutics13091397). This supports the need for carefully controlled Sirolimus API quality in formulation and analytical-development programs.
Analytical and impurity-control development
Buyers typically evaluate assay, related substances, residual solvents, water content, identity, solid-state form, impurity profile, and stability behavior before moving from sample quantities to pilot or commercial batches. We supply API only, not finished dosage forms, device products, compounded preparations, or branded medicines.
> Sourcing & Supply
Suzhou Pharmaceutical Technology Co., Ltd. is an R&D-driven pharmaceutical company with synthesis, purification, and analytical capability for Sirolimus API. Small batches (up to 10 kg) are prepared directly by our technical team in Suzhou. For larger commercial quantities, production is scaled up at qualified manufacturing facilities, with export documentation provided according to the order scope.
- Small-batch orders (≤10 kg): prepared by our technical team in Suzhou. Lead time 10–14 business days from order confirmation.
- Commercial bulk (>10 kg): scaled up at qualified manufacturing facilities. Lead time 14–21 business days depending on batch size and documentation.
We export Sirolimus API to buyers across South America — including Brazil, Argentina, Colombia, Chile, Peru, Ecuador, Bolivia, Paraguay, and Uruguay — as well as to Australia, New Zealand, Mexico, and Canada. Inquiries from European, Middle Eastern, and Asian markets are also welcome.
> Quality & Export Documentation
Each Sirolimus API order is supplied against the agreed specification. Standard release controls can include appearance, identification, assay by HPLC, related substances, water content, residual solvents, and microbial limits when required by the order scope.
- COA: included with every order.
- MSDS: included with every order.
- COO: available for commercial bulk orders above 10 kg.
- Additional package: specification sheet, chromatogram, residual-solvent data, and stability-related information can be discussed before order confirmation.
> Packaging & Storage
Sirolimus API is packed in sealed foil bags or foil-lined fibre drums, with secondary protection selected according to quantity and shipping route. Low-temperature or insulated shipping can be arranged when required by the agreed handling plan.
> Pricing & Order Information
Pricing is quoted case by case based on quantity, specification, documentation, destination country, and shipping requirements. MOQ is typically 100 g, and sample quantities of 10–50 g are available for qualified buyers before pilot or commercial orders.
> FAQ
What is the minimum order quantity for Sirolimus API?
The minimum order quantity for Sirolimus API is typically 100 grams. Sample quantities of 10–50 g are available for qualified buyers.
What documents are included with a Sirolimus bulk order?
All Sirolimus orders include a COA and MSDS in English. For commercial bulk orders above 10 kg, COO is available as standard export documentation.
Can I request a Sirolimus sample before placing a bulk order?
Yes. Sample quantities of 10–50 g are available for qualified buyers before pilot or commercial orders.
Do you export Sirolimus API to South America?
Yes. We support inquiries from Brazil, Argentina, Colombia, Chile, Peru, Ecuador, Bolivia, Paraguay, and Uruguay.
Is Rapamycin the same as Sirolimus?
Yes. Rapamycin is a common synonym for Sirolimus; we supply API, not branded finished medicine.
Can buyers in Australia, New Zealand, Mexico, or Canada order Sirolimus API?
Yes. We handle qualified inquiries from Australia, New Zealand, Mexico, Canada, and other international markets.
What specification is available for Sirolimus CAS 53123-88-9?
Sirolimus is supplied by agreed HPLC specification, including assay, related substances, residual solvents, water content, identity, and stability-related controls when required.
How is Sirolimus packaged and shipped internationally?
Sirolimus API is shipped in foil bags or foil-lined fibre drums, with low-temperature or insulated handling when required by the agreed route.
Do you supply finished Sirolimus dosage forms?
No. We supply Sirolimus API, not finished dosage forms, device products, compounded products, or branded medicines.
What is Sirolimus used for in development programs?
Sirolimus is used in macrolide mTOR-inhibitor formulation, analytical-development, and research programs where local regulations permit.
> Related Products
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- Cyclosporine A | CAS 59865-13-3 — peptide immunosuppressant API
- Mycophenolic Acid | CAS 24280-93-1 — immunosuppressant API
- Clindamycin HCL | CAS 21462-39-5 — antibacterial API
> Request a Quote or Sample
To request a quote or sample for Sirolimus API (CAS 53123-88-9), please contact us directly at Info@fmyykj.com.
Include in your inquiry: required quantity (grams or kg), destination country, documentation requirements (COA + MSDS standard; COO for bulk), low-temperature shipping requirement if applicable, and intended use (formulation / analytical development / research / other). We respond to all inquiries within 1 business day.
Last reviewed: June 2026