Synonyms: 1H-Xanthene-2,7-dicarboxylicacid,4,4a,9,9a-tetrahydro-4,4a-dihydroxy-6-methoxy-3,4,5,8,9a-pentamethyl-1-oxo-,2-[4-[(4-carboxy-3-methoxy-2,5,6-trimethylphenoxy)carbonyl]-3-methoxy-2,5,6-trimethylphenyl]7-(4-carboxy-3-methoxy-2,5,6-trimethylphenyl) ester, (4a,4ab,9ab)-; Thielocin A 1b