Patent classifications
C
CHEMISTRY; METALLURGY
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C07
ORGANIC CHEMISTRY
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C07C
ACYCLIC OR CARBOCYCLIC COMPOUNDS
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2603/00
Systems containing at least three condensed rings
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C07C2603/02
Ortho- or ortho- and peri-condensed systems
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C07C2603/04
containing three rings
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C07C2603/06
containing at least one ring with less than six ring members
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C07C2603/10
containing five-membered rings
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C07C2603/12
only one five-membered ring
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