Why do you want enzymes to reduce ephedrine? I think it would be much cheaper to grow your own genetically enhanced (DEA would read it as deteriorated) microorganisms...
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There are some articles dealing with microorganisms in organic chemistry, but all by all we can't use many of them. A great find would be a genetically enhanced microorganism that can synthesize MDA or MDMA when it is doped with sugar. Plants can do it, we only need some researchers for our good cause
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And fully synthetic enzymes, that will take a while... And will be very expensive as well.
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