gas-liquid chromatograms of reaction mixtures of single- and multistep reactions readily provide information on the effects on the 11alpha-hydroxy and other functional groups at positions 3 and 17 ( androstane series ) and positions 3 and 20 ( pregnane series ) , and the retention times of many steroids unavailable from commercial or other sources .
C0033006
pregnane
C0038317
steroids