Solve this ‘wordoku’ in the same way as a sudoku with letters instead of numbers (the nine letters once in each row, column and nine-square cell). Once solved, one of the overall diagonals contains the jumbled surname of a chemist who was selected by Sir Derek Barton to deliver the first Texas A&M Barton lecture in 1997 – the only Barton lecture to take place before Barton’s death in 1998.
This week’s letters are: A E H L O P R S T





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