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Questions about the application of chemistry to interrogate and modify biological systems and processes.

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Preferred IUPAC name of Protoporphyrin IX

I was looking up protoporphyrin IX and was surprised to find that no two websites gave the same IUPAC name for the compound. Here are some examples: 3,3'-(7,12-Diethenyl-3,8,13,17-tetramethylporphyr …
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