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C.I. 73000; C.I. Vat Blue 1; 2,2'-biindole-3,3'(1H,1'H)-dione
2-(1,3-Dihydro-3-oxo-2H-indol-2-ylidene)-1,2-dihydro-3H-indol-3-one;
2,2'-Bis(2,3-dihydro-3-oxoindolylidene); Indigo blue; Vat Blue 1;