Patent classifications
C
CHEMISTRY; METALLURGY
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C07
ORGANIC CHEMISTRY
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C07D
HETEROCYCLIC COMPOUNDS
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405/00
Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom
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C07D405/02
containing two hetero rings
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C07D405/12
linked by a chain containing hetero atoms as chain links
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