# 21-crown-7

> chemical compound

**Wikidata**: [Q55176433](https://www.wikidata.org/wiki/Q55176433)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/21-Crown-7)  
**Source**: https://4ort.xyz/entity/21-crown-7


## References

1. [CAS Common Chemistry](https://commonchemistry.cas.org/detail?cas_rn=33089-36-0)
2. 1,4,7,10,13,16,19-heptaoxacyclohenicosane. ECHA Substance Infocard database
3. Mapping file of InChIStrings, InChIKeys and DTXSIDs for the EPA CompTox Dashboard
4. UniChem