Figure 2. Structure of the compound (2Ꞌ-{[(E)-3Ꞌ-hydroxyandrost-5-en-17-ylidene]methyl}-4Ꞌ,5Ꞌ-dihydro-1Ꞌ,3Ꞌ-oxazole), which showed the greatest inhibitory activity towards cytochrome P450 17A1 in the 17α-hydroxylation reaction of pregnenolone.