Figure 1.

Chemical structure of rhein. ChemSpider ID: 9762; Systematic name: 4,5-Dihydroxy-9,10-dioxo-9,10-dihydro-2-anthracenecarboxylic acid; Molecular Formula: C15H8O6; Mass: 284.032074 Da.

Zhang et al. BMC Systems Biology 2012 6:20   doi:10.1186/1752-0509-6-20
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