Investigate purpose of chemical code

[madison-feshuk]

CASRN is converted to code by removing dashes and underscores

CompTox-ToxCast-tcpl/R/tcplLoadChem.R

Line 89 in 558d8f6

dat[!is.na(casn) , code := paste0("C", gsub("-|_", "", casn))]

What is the purpose of this field? Should we consider remove