HETERO-TETRACYCLIC HYDROCARBONS
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BTHETERO-POLYCYCLIC HYDROCARBONS/SUBDIVISION ACCORDING TO NUMBER OF RINGS
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UDC547.89,9*0*2*2
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Descriptor GERHETERO-TETRACYCLISCHE KOHLENWASSERSTOFFE
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Descriptor ENGHETERO-TETRACYCLIC HYDROCARBONS
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Descriptor FREHYDROCARBURES HÉTÉROTÉTRACYCLIQUES
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Variant GERHETERO-TETRAZYKLISCHE KOHLENWASSERSTOFFE
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Variant GERHETEROTETRACYCLEN
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Variant GERHETEROTETRAZYKLEN
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Variant ENGHETEROTETRACYCLES
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Variant FREHÉTÉRO TÉTRACYCLES
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NTHETERO-TETRACYCLIC HYDROCARBONS/NITROGEN DIHETERO