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(P657)
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English
RTECS number
chemical identifier from the Registry of Toxic Effects of Chemical Substances
In more languages
Data type
External identifier
Statements
instance of
Wikidata property to identify substances
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applicable 'stated in' value
Registry of Toxic Effects of Chemical Substances
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Wikidata property example
beryllium
RTECS number
DS1750000
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ethanol
RTECS number
KQ6300000
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format as a regular expression
[A-Z]{2}\d{7}
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source website for the property
http://www.cdc.gov/niosh/npg/npgdrtec.html
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property usage tracking category
Category:Pages using Wikidata property P657
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property proposal discussion
https://www.wikidata.org/wiki/Wikidata:Property_proposal/Archive/9#P657
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Constraints
property constraint
format constraint
format as a regular expression
[A-Z][A-Z]\d{7}
constraint status
mandatory constraint
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distinct-values constraint
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single-value constraint
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allowed-entity-types constraint
item of property constraint
Wikibase item
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