55256-57-0 5H-Furo(3',2':4,5)furo(3,2-b)xanthen-5-one, 3a,12a-dihydro-4,6-dihydroxy-9-(3-hydroxy-3-methylbutyl)-, (3as-cis)- Austocystin B BRN 5168709 CCRIS 2006