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Why is the catalog number on my Reference Standard different than others, and will that affect its compendial use?

April 26, 2017affect catalog compendial different Reference standard

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Why is the catalog number on my Reference Standard different than others, and will that affect its compendial use?

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In July 2002, USP decided to improve the numbering system for all of our Reference Standard products. USP added a “1” as the first digit of the item number and removed the “–”punctuations.