Ball-and-stick model of an L -methadone molecule, C ₂₁ H ₂₇ NO, as found in the crystal structure determined by single-crystal X-ray diffraction and reported in Acta. Chem. Scand. (1974) 5-12 ( CSD entry METHAD01 ).

Colour code:

Carbon, C: grey

Hydrogen, H: white

Nitrogen, N: blue

Oxygen, O: red