# Export Enquiries Welcome | Batch-to-Batch Consistency

API Impurities and Working Standards for Global Pharma Buyers

India-based manufacturer and exporter of high-purity API impurities, impurity standards, working standards, intermediates, and custom synthesis materials for overseas pharmaceutical QC, R&D, CRO, and sourcing teams.

500+

Compounds in Portfolio

99%+

Purity Standards

50+

Export Markets Supported

10+

Years Experience

Featured Reference Standards

Azithromycin Impurity A ≥99.5%
Ciprofloxacin EP Impurity ≥99.0%
Metformin Related Compound ≥98.5%
Ibuprofen Impurity F ≥99.0%

API Impurities, Working Standards, and Custom Synthesis

From milligram-scale custom synthesis to repeat supply discussions, Swapreen Pharma supports overseas buyers seeking API impurities, working standards, drug intermediates, and analytical documentation from India.

API Impurities

Certified process-related impurities, degradation products, and genotoxic impurities at ≥95% to ≥99.9% purity. Full CoA with HPLC, NMR, MS, and IR data supplied with every batch.

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Working Standards

High-purity in-house reference standards calibrated against USP, EP, and BP primary standards. Ideal for routine QC, method validation, dissolution testing, and system suitability.

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Pharmaceutical Intermediates

Key drug intermediates for API manufacturing and clinical development — including chiral intermediates with high enantiomeric excess, available from gram to multi-kilogram scale.

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Custom Synthesis

Bespoke synthesis of compounds not available in our catalogue — novel molecules, rare impurities, isotopically labelled analogues, and proprietary intermediates under full NDA protection.

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API Impurities Manufacturer and Exporter from India

Swapreen Pharma Pvt. Ltd. is a manufacturer and exporter from India supplying pharmaceutical API impurities, impurity standards, working standards, and custom synthesis materials for global pharmaceutical quality control, analytical testing, sourcing, and regulatory-support workflows.

Advanced Synthesis Techniques — Each compound produced using modern analytical instruments to ensure purity, accuracy, and reliability.

International Compliance — Products meet ICH, USP, EP, and other international regulatory standards for pharmaceutical testing.

Custom Impurity Synthesis — Specialized services for metabolites, degradation products, and unique research compounds.

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500+

API Impurities & Reference Standards in catalogue

50+

Countries with active pharmaceutical clients

99.5%

Average purity achieved across our catalogue

48 hrs

Average quote turnaround for custom compounds

Featured API Impurities and Working Standards

A selection from our catalogue of API impurities, impurity standards, and reference standards from India. Don't see what you need? We offer custom synthesis.

Azithromycin Impurity A

CAS: 117772-70-0
Macrolide Antibiotic

Azithromycin Impurity B

CAS: 83905-01-5
Macrolide Antibiotic

Ciprofloxacin EP Impurity A

CAS: 93107-30-3
Fluoroquinolone

Ciprofloxacin Impurity B

CAS: 86483-48-9
Fluoroquinolone

Metformin Related Compound A

CAS: 5700-49-2
Biguanide

Metformin HCl Impurity

CAS: 1115-70-4
Biguanide

Ibuprofen Impurity F

CAS: 15687-27-1
NSAID

Ibuprofen Related Compound

CAS: 51146-56-6
NSAID

API Impurity Supplier India and Export Market Support

Browse priority export markets for API impurities, working standards, and custom synthesis enquiries from outside India.

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Request a custom quote online. Our team responds within 24–48 hours with pricing and availability.