When designing an experimental setup and we want to buy a certain chemical, for example; let's say we want to buy penicillin; cas number: 61-33-6.
Then we realize that we don't have enough money for the experiment with this chemical. But related chemicals such as
113-98-4 (mono-potassium salt)
69-57-8 (mono-hydrochloride salt)
are cheaper and we decide to purchase one of these two products. But of course their cas numbers are different.
How logical and reliable would it be to continue the experiments in this way and try to make a publication?
Let's say I asked this situation to write an article in the field of biosensors.
The CAS number is the actual ID of that very compound. If you feel you can use a replacement, use it but you will need to declare the actual compound/starting material/reagent/synthon you used with its CAS number. No two compounds CAS number can be exchanged.
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