The solution to this sudoku-style puzzle hides a metabolite named after a Japanese flower

Solve this wordoku in the same way as a sudoku with letters instead of numbers (each of the nine letters in each row, column and nine square cell). Once solved, one of the overall diagonals can be rearranged into the name of a biochemical metabolite found in plants and microorganisms.

This week’s letters are: A D E H I K M S T