A question-and-answer guide the International Council for Harmonization of Technical Requirements for Pharmaceuticals for Human Use, or ICH, is developing on the topic of starting materials for drug substance manufacture will provide more detail on just what information applicants need to provide regulators on starting materials and is expected to better clarify the differences between custom-manufactured chemicals and those that are commercially available.
However, the ICH Q11 Q&A guide will stop short of saying how many synthesis steps must occur after chemicals have...
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