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Emodin-1-O-β-gentiobioside is an anthraquinone[1][2].

[1] Srijan Shrestha, et al. Two new naphthalenic lactone glycosides from Cassia obtusifolia L. seeds. Arch Pharm Res. 2018 Jul;41(7):737-742. DOI:10.1007/s12272-018-1044-0
[2] Chen Zhang, et al. Structure elucidation of a sodium salified anthraquinone from the seeds of Cassia obtusifolia by NMR technique assisted with acid-alkali titration. Magn Reson Chem. 2011 Aug;49(8):529-32. DOI:10.1002/mrc.2771