Catlin\'s team of eight scientists used a mass spectrometer to create a molecular map of the substance and determine if it was in fact a drug . One of their first tests was positive for testosterone leading them down the anabolic steroid path . Once the mapping was completed , Catlin\'s team named the drug tetrahydrogestrinone , or THG . It was similar in structure to two other anabolic steroids already on the banned substances list , gestrinone and trenbolone -- which I\'ve written about extensively in my articles on Fina conversion . Fina Conversion Article 1 - Fina Conversion Article 2 .