CPC Class Codes
A61K 31/192
having aromatic groups, e.g...
A61K 31/352
condensed with carbocyclic ...
A61K 31/381
having five-membered rings
A61K 31/4184
condensed with carbocyclic ...
A61K 31/4709
Non-condensed quinolines an...
A61K 31/4741
condensed with ring systems...
A61K 45/06
Mixtures of active ingredie...
A61P 31/12
Antivirals
A61P 31/18
for HIV
C07C 2601/02
with a three-membered ring
C07C 2601/08
the ring being saturated
C07C 59/13
containing rings
C07D 311/04
Benzo[b]pyrans, not hydroge...
C07D 311/58
other than with oxygen or s...
C07D 405/04
directly linked by a ring-m...
C07D 405/10
linked by a carbon chain co...
C07D 409/10
linked by a carbon chain co...
C07D 491/052
the oxygen-containing ring ...