4-Butoxy-N'-[(3Z)-5-nitro-2-oxo-1,2-dihydro-3H-indol-3-ylidene]benzenesulfonohydrazide;benzenesulfonic acid, 4-butoxy-, 2-[(3Z)-1,2-dihydro-5-nitro-2-oxo-3H-indol-3-ylidene]hydrazide
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