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C9H6N2O

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C9H8N2O
C8H4N2O C9H6N2O C10H8N2O
C9H4N2O

C9H6N2 C9H6N2O2
C9H5NO C9H7N3O

化學式C9H6N2O(摩爾質量:158.2 g/mol)可以指: