[plt-scheme] String -> listof symbols

Hi All --

Is there an easy way to convert a string like this -- "(a or (b and c))" --
 to a list-of-symbols equivalent to '(a or (b and c)) ?

(string->symbol "(a or (b and c))" returns '|(a or (b and c))|" . What do
the the vertical lines which book-end the output value signify?

Thanks!

Dave Yrueta
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