motif_tree.json

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          "smi_am": "*[Si:1]([CH3:2])([CH3:3])[CH3:4]",
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          "smi_am": "*[N:1]([CH3:2])[O:3][CH3:4]",
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     "*CCO*": {
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          "smi_am": "*[CH2:1][CH2:2][O:3][*:4]",
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     "*C1CCCCO1": {
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                              "smi_am": "*[*:1][CH3:4]",
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}