gtoxCode2CASN takes a code and converts it CAS Registry Number.
Character of length 1, a chemical code
The function checks for the validity of the CAS Registry Number. Also, the ToxCast data includes chemcials for which there is no CASRN. The convention for these chemicals is to give them a CASRN as NOCAS_chid; the code for these compounds is CNOCASchid. The function handles the NOCAS compounds as they are stored in the database, as shown in the exmaple below.
A CAS Registry Number.
1 2 3
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