NRayya

Draft of DefinedTerm profile

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- [ ] [inDefinedTermSet](http://schema.org/inDefinedTermSet) expected type is text. In schema.org it can also be [DefinedTermSet](https://schema.org/DefinedTermSet) or [URL](https://schema.org/URL). - [ ] [name](http://schema.org/name): The provided example is for termCode not name. -...

In the frequency units here https://terminology.nfdi4chem.de/ts/ontologies/uo/terms?iri=http%3A%2F%2Fpurl.obolibrary.org%2Fobo%2FUO_0000105&viewMode=All&siblings=false , I believe the megahertz should be grouped under hertz based unit.

Add new compounds

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- [x] (CD3)4Si: Description: https://isotope.com/synthetic-intermediates/tetramethylsilane-d12-d-dlm-2729-0 - [x] K[NbCl6]: Description: https://www.degruyter.com/document/doi/10.1524/zkri.2010.1212/html?lang=en