prefix	name	description
000234	PubChem conformer	None
000303	GenBank Protein Identifier	None
000447	European Community number	A seven-digit identifier for chemical substances for regulatory purposes within the European Union.
000467	validated chemical database	None
000565	National Service Center number	Identifier used by the Cancer Chemotherapy National Service Center.
000566	RTECS	Identifier used by the RTECS database (http://www.cdc.gov/niosh/rtecs/).
