OXETANES (HETEROCYCLIC HYDROCARBONS)
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BTHETERO-MONOCYCLIC HYDROCARBONS/OXYGEN MONOHETERO, 4-MEMBERED RING
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UDC547.7,0*0*0*1*2*1
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Descriptor GEROXETANE (HETEROCYCLISCHE KOHLENWASSERSTOFFE)
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Descriptor ENGOXETANES (HETEROCYCLIC HYDROCARBONS)
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Descriptor FREOXÉTANES (HYDROCARBURES HÉTÉROCYCLIQUES)
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NTDIKETENES + KETOKETENES + ACETYLKETENES (POLYCARBONYLS)
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NTPROPIOLACTONES (LACTONES OF MONOHYDROXYCARBOXYLIC ACIDS)