3-Methoxy butyraldehyde 3-Methoxybutanal 3-Methoxybutyraldehyde 4-01-00-03984 (Beilstein Handbook Reference) 5281-76-5 AI3-25355 Aldol ether BRN 1740323 Butanal, 3-methoxy- (9CI) Butyraldehyde, 3-methoxy- NSC 71979 beta-Methoxybutyraldehyde