115884-42-9
3β-tertiobutyldimethylsilyloxy-18-vinyl-20,20-ethylenedioxy-pregn-5-ene
→
115884-44-1
18-vinyl-20,20-ethylenedioxy-pregn-4-ene-3-one
115910-66-2
3β-tertiobutyldimethylsilyloxy-18-carboxaldehyde-20,20-ethylenedioxy-pregn-5-ene