Chemical Name: 4,5-Dihydroxy-9,10-dioxo-9,10-dihydroanthracene-2-carboxylic acid
Synonym: Rhein
Smiles: OC1=CC=CC2=C1C(C(C(O)=CC(C(O)=O)=C3)=C3C2=O)=O
Inchi: InChI=1S/C15H10O5/c16-6-7-4-9-13(11(18)5-7)15(20)12-8(14(9)19)2-1-3-10(12)17/h1-5,16-18H,6H2