Synonyms: 38746-53-1;38746-54-2;7H-Furo(3',2':4,5)furo(2,3-c)xanthen-7-one, 2-(acetyloxy)-1,2,3a,12c-tetrahydro-8-hydroxy-6-methoxy-;7H-Furo(3',2':4,5)furo(2,3-c)xanthen-7-one, 2-(acetyloxy)-2,3,3a,12c-tetrahydro-8-hydroxy-6-methoxy-, (2alpha,3aalpha,12calpha)-