Puzzle 23 - Sadako

Puzzle:

[Solution: Start by identifying the chemicals represented by Roman numerals in each of the formulas using Google or your knowledge of chemistry. Realizing that the boxes in the grid are arranged like the molecular shape of the molecule and have the same number of boxes as the number of elements in the molecule, place the molecules in, using the shape as a guide. (For instance, by looking at the reaction 2H₂ + O₂ → 2II, players can solve and get II as the molecule H₂O. Then, in the grid, where II spans 3 boxes in an L shape, players can match it to the shape of an H₂O molecule and know that the central one is O while the other two are H.) Realizing the title Sadako is awfully close to the name of another puzzle type -- Sudokus -- and that the elements used have atomic numbers 1 - 8, use the bold lines and Sudoku rules to play Sudoku and fill out the rest of the grid. Using the flavor text about folding and wings, puzzlers realize they must fold a paper crane using the final sudoku (also hinted by Sadako, who notably folded 1000 paper cranes). The only numbers fully visible on the bottom of the wings are 6 1 1 1 or, in elements, CHHH or CH3. In other words, the final answer: METHYL.]