Try searching for...
SCFBio, IIT Delhi
Formula: C20H22O9 | Mol. Weight: 406.40 g/mol
IUPAC: (2S,3R)-3-[(1S,3S,4R)-3,4-dihydroxy-1-methoxy-2-oxopentyl]-2,6,8,9-tetrahydroxy-3,4-dihydro-2H-anthracen-1-one
CC(C(C(=O)C(C1CC2=CC3=CC(=CC(=C3C(=C2C(=O)C1O)O)O)O)OC)O)O