(1,2,3,5(Or 1,2,3,6)-tetrahydro-3-hydroxy-1-methyl-5(or 6)-oxo-6H(or 5H)-indol-6(or 5)-al) semicarbazone;(2E)-2-(3-hydroxy-1-methyl-5-oxo-1,2,3,5-tetrahydro-6H-indol-6-ylidene)hydrazinecarboxamide
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