XANTHINE AND DERIVATIVES (HETEROCYCLIC HYDROCARBONS)
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BTHETERO-BICYCLIC HYDROCARBONS/NITROGEN TETRAHETERO
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BTCONDENSED HETERO-POLYCYCLIC HYDROCARBONS/ONLY NITROGEN AS HETEROATOM
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BTPURINES (HETEROCYCLIC HYDROCARBONS)
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UDC547.89,9*1*1*4*1*1*3
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Descriptor GERXANTHIN UND DERIVATE (HETEROCYCLISCHE KOHLENWASSERSTOFFE)
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Descriptor ENGXANTHINE AND DERIVATIVES (HETEROCYCLIC HYDROCARBONS)
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Descriptor FREXANTHINE ET DÉRIVÉS (HYDROCARBURES HÉTÉROCYCLIQUES)
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NTCAFFEINE AND DERIVATIVES (ALKALOIDS)
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NTTHEOBROMINE AND DERIVATIVES (ALKALOIDS)