11,11-Dimethyl-1H-difuro[3,4-b:3',4'-i]xanthene-1,3,7,9(11H)-tetrone

11,11-Dimethyl-1H-difuro[3,4-b:3',4'-i]xanthene-1,3,7,9(11H)-tetrone · CAS 152543-67-4