Journal of Labelled Compounds and Radiopharmaceuticals -V o L X V I , No. 6 NOTES 1 SYNTHESIS OF [ 20-l4C] -METHANDROSTENOLONE KEY WORDS Dehydro*androsterone (3@-hydroxyandrost-5-en-l7-one); 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ); methandrostenolone (17a-methyl-176-hydroxyandrosta-14 1,4-dien-3-one); [20-C]-methandrostenolone.