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Quetiapine fumarate API is produced by many manufacturers around the world; there isn’t a single supplier. The original molecule was developed by AstraZeneca, but after patent expiry a large number of generic API makers now produce it. Some commonly cited API manufacturers (illustrative, not exhaustive): - AstraZeneca (historical/original supplier for Seroquel) - Indian API producers often listed in catalogs and filings: Laurus Labs, Hetero Drugs, Aurobindo Pharma, Sun Pharmaceutical Industries, Zydus Cadila, Dr. Reddy’s Laboratories, Lupin - Other global players (including contract manufacturers) in Europe/US/China markets If you want a current, region-specific, or regulator-verified list (with GMP status or DMF numbers), I can help look that up or guide you on how to verify suppliers. What region or use case do you have in mind (e.g., regulatory filing, procurement, or academic inquiry)?
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