Chemical Name: Pregn-4-ene-20-carboxaldehyde, 3-oxo-, (20S)-; (20S)-3-Oxo-pregn-4-ene-20-carboxaldehyde; 3-Oxo-pregn-4-ene-20α-carboxaldehyde; (20S)-3-Oxopregn-4-ene-20-carboxaldehyde; 3-Oxo-23,24-dinorchol-4-en-22-al; 3-Oxopregn-4-ene-20-carboxaldehyde; Dinorcholenaldehyde; NSC 9738; U 3687