Acid-catalysed ring contraction of steroidal 1 alpha,2alpha-epoxy-4-en-3-ones.
D000736:Androstenes; D002384:Catalysis; D055598:Chemical Phenomena; D002621:Chemistry; D004988:Ethers, Cyclic; D006863:Hydrogen-Ion Concentration
D000736:Androstenes; D004988:Ethers, Cyclic