121313-74-4 [1,9'-Bianthracene]-1',4',5(6H)-trione,7,8-dihydro-2,7,7',10,10'-pentahydroxy-4,5'-dimethoxy-2',7-dimethyl-,stereoisomer 59554-12-0 (1R)-4α-Acetoxy-3,3,4,4,5,5,6,10-octahydro-3α,9-dihydroxy-6β-methyl-5,10-dioxospiro[1H-naphtho[2,3-c]pyran-1,2-[2H]pyran]-3α-acetic acid