TETRAZINES AND DERIVATIVES (HETEROCYCLIC HYDROCARBONS)
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BTHETERO-MONOCYCLIC AROMATIC HYDROCARBONS
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BTHETERO-MONOCYCLIC HYDROCARBONS/NITROGEN TETRAHETERO, 6-MEMBERED RING
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UDC547.882/.884
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Descriptor GERTETRAZINE UND DERIVATE (HETEROCYCLISCHE KOHLENWASSERSTOFFE)
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Descriptor ENGTETRAZINES AND DERIVATIVES (HETEROCYCLIC HYDROCARBONS)
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Descriptor FRETÉTRAZINES ET DÉRIVÉS (HYDROCARBURES HÉTÉROCYCLIQUES)