(3S,3'S,4S,4'S,4aR,4'aR)-2,2',3,3',4,4',9,9'-Octahydro-1,1',4,4',8,8'-hexahydroxy-3,3'-dimethyl-9,9'-dioxo-7,7'-bi(4aH-xanthene)-4a,4'a-dicarboxylic acid dimethyl ester;Ergochrome BB;Ergochrome BB(2,2');Secalonic acid B
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