std::string OEToASCII(const char *ptr,
                      const bool remove_markup = true)

Convert the string ‘ptr’, typically the output of the function OECreateIUPACName optionally post-processed by a language translation function, from the internal encoding, which uses \u escapes to represent non-ASCII characters, into a reduced 7-bit ASCII representation by mapping accented 8-bit characters into their ASCII counterparts.

The ‘remove_markup’ flag controls the disposition of italics, superscript, and subscript markup. If the value is true (the default), the markup is removed. If false, the markup is left in the output string, which should be post-processed.