That's not true. Some types of chemistry cannot (legally) be reproduced, but they are still good and valid science. For a trivial example, consider the many che

That's not true. Some types of chemistry cannot (legally) be reproduced, but they are still good and valid science. For a trivial example, consider the many chemistry papers based on measuring fallout effects from nuclear testing. More prosaically, some things can be verified even when a chemical process cannot be reproduced. Protein crystallization is a tricky process with many irreducible results. Yet if you have a crystal, and can use the crystal to determine the protein structure, then you can verify that the crystal indeed contains that protein - even if you are unable to reproduce the chemical process used to create the crystal in the first place. Others can use the same sample to re-verify the resulting x-ray structure even though they also might be unable to reproduce the crystallization step.