| 540 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES |
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| * | DD | ORGANIC COMPOUNDS (Class 532, Subclass 1) {1} |
| 1 | DF | .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS {6} |
| 121 | DF | .~.~ Azaporphyrins {1} |
| 122 | DF | .~.~.~ Phthalocyanines {8} |
| 139 | DF | .~.~.~.~ Metal containing {1} |
| 140 | DF | .~.~.~.~.~ Heavy metal or aluminum containing {2} |
| 142 |  | .~.~.~.~.~.~ Processes of forming the phthalocyanine ring system {2} |
| 143 | DF | .~.~.~.~.~.~.~> From reactant which contains plural cyano groups (e.g., preparing from phthalonitrile, etc.) |
| 144 | DF | .~.~.~.~.~.~.~> From reactant which contains plural carbonyl groups (e.g., preparing from phthalic anhydride, etc.) |