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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13/00
Cyclic hydrocarbons containing rings other than, or in addition to, six-membered aromatic rings
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C07C13/28
Polycyclic hydrocarbons or acyclic hydrocarbon derivatives thereof
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C07C13/62
with more than three condensed rings
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C07C13/66
the condensed ring system contains only four rings
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