Patent classifications
C
CHEMISTRY; METALLURGY
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C07
ORGANIC CHEMISTRY
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C07D
HETEROCYCLIC COMPOUNDS
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239/00
Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings
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C07D239/70
condensed with carbocyclic rings or ring systems
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C07D239/72
Quinazolines; Hydrogenated quinazolines
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C07D239/95
with hetero atoms directly attached in positions 2 and 4
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C07D239/96
Two oxygen atoms
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