Abstract
Base (I), the structure of which had been considered to be that of O-methylpilocereine and O-methylpiloceredine, was synthesized from diphenyl ether dicarboxaldehyde (III). One of its racemic diastereomers was isolated in crystalline state. Both the crystalline base (I) and the mixture of its diastereomers had identical infrared spectra with O-methylisopilocereine in chloroform solution. The chromatographic behaviours also suggested that the formula (I) represents O-methylisopilocereine, not O-methylpilocereine.
