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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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50/00
Quinones
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C07C50/16
the quinoid structure being part of a condensed ring system containing three rings
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C07C50/18
Anthraquinones, i.e. C14H8O2
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