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Get a sample from each of them with the Certificate of Analysis. Then conduct a study on each sample to see if there is some characteristic that is different about one over any of the others.
Perhaps I'm not understanding your question.Are you asking which company invented a molecule?I assumed you had a raw material but didn't know who manufactured it. My answer was telling you one way to identify the manufacturer of a specific sample.Perhaps, reword your question? What exactly are you trying to figure out?