HETERO-BICYCLIC HYDROCARBONS/NITROGEN TETRAHETERO
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BTHETERO-BICYCLIC HYDROCARBONS
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BTHETERO-BICYCLIC HYDROCARBONS/MORE THAN 3 NITROGENS IN THE RINGS
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UDC547.89,9*1*1*4*1*1
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Descriptor GERHETERO-BICYCLISCHE KOHLENWASSERSTOFFE/STICKSTOFF-TETRAHETERO
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Descriptor ENGHETERO-BICYCLIC HYDROCARBONS/NITROGEN TETRAHETERO
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Descriptor FREHYDROCARBURES HÉTÉROBICYCLIQUES/AZOTE-TÉTRAHÉTÉRO
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Variant GERHETERO-BIZYKLISCHE KOHLENWASSERSTOFFE/STICKSTOFF-TETRAHETERO
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Variant GERHETEROBICYCLEN/STICKSTOFF-TETRAHETERO
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Variant GERHETEROBIZYKLEN/STICKSTOFF-TETRAHETERO
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Variant ENGHETEROBICYCLES/NITROGEN TETRAHETERO
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Variant FREHÉTÉROBICYCLES/AZOTE-TÉTRAHÉTÉRO
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NTPTERIDINES (HETEROCYCLIC HYDROCARBONS)
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NTXANTHINE AND DERIVATIVES (HETEROCYCLIC HYDROCARBONS)