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Analytical & Chromatography
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4-Aminosalicylic acidpharmaceutical secondary standard; traceable to USPPHR1746SIGPHR1746-500MG-EA
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4-Epianhydrotetracycline hydrochlorideEuropean Pharmacopoeia (EP) Reference StandardE0400000SIGE0400000-EA -
4-Epianhydrotetracycline hydrochloridepharmaceutical secondary standard; traceable to USP, PhEurPHR1691SIGPHR1691-100MG-EA -
4-Epianhydrotetracycline hydrochlorideUnited States Pharmacopeia (USP) Reference Standard1236506SIG1236506-50MG-EA -
4-Epitetracycline hydrochlorideEuropean Pharmacopoeia (EP) Reference StandardE0600000SIGE0600000-EA -
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6-Hydroxynicotinic acidUnited States Pharmacopeia (USP) Reference Standard1327408SIG1327408-50MG-EA
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![6-Nitrobenzo[a]pyreneBCR(R) certified Reference Material](https://scis.nroge.redpernix.com/media/catalog/product/cache/18c147254acb4a98c031bfc3f794e0d9/S/i/Sigma_Aldrich_BCR31110MG_6Nitrobenzoapyrene_original_1277506.png)
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![6H-Benzo[cd]pyren-6-oneBCR(R) certified Reference Material](https://scis.nroge.redpernix.com/media/catalog/product/cache/18c147254acb4a98c031bfc3f794e0d9/S/i/Sigma_Aldrich_BCR33910MG_6HBenzocdpyren6one_original_1602229.png)
