55256-58-1 5H-Furo(3',2':4,5)furo(3,2-b)xanthen-5-one, 3a,12a-dihydro-7-chloro-4,6-dimethoxy-, (3aS,12aR)- 5H-Furo(3',2':4,5)furo(3,2-b)xanthen-5-one, 3a,12a-dihydro-7-chloro-4,6-dimethoxy-, (3aS-cis)- Austocystin A BRN 1272581 CCRIS 2005