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Results for conversion of either structure -> CAS Registry Numbers® or CAS Registry Numbers® -> structure are retrieved from publicly available sources hosted by the U.S. National Institutes of Health (“NIH”) and the Wikimedia Foundation.

CONFIDENTIALITY ALERT! For structure -> CAS Registry Numbers® conversion, each structure will be sent out to public database server to retrieve CAS Registry Numbers®. Please do not choose this option if any structure is confidential. You are taking full responsibility and ChemAxon shall assume no liability whatsoever if you proceed further.

CAS Registry Number® is a registered trademark of the American Chemical Society.

CAS, a division of the American Chemical Society, is the authoritative source for a CAS Registry Number®. Please contact CAS at for more information about assignment and validation of a CAS Registry Number®.