15,18-Etheno-2,6:9,13-dimetheno-1,14-benzodioxacyclodocosin-11,12,24-triol, 7,8,19,20-tetrahydro- 7,8,19,20-Tetrahydro-15,18-etheno-2,6:9,13-dimetheno-1,14-benzodioxacyclodocosin-11,12,24-triol 88418-46-6 Marchantin A