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Answer:
Availability of reagents on the marketplace is verified during the drafting process of a monograph. If you have difficulty in obtaining a reagent from your regular supplier, carry out a web search to find an alternative. The best search term is the Chemical Abstracts Service registry number (CAS Number). These are given in the reagent description in general chapter 4.1.1 of the Ph. Eur. Searches can also be made using the reagent name and any synonyms.
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