| 502 / | HD | CATALYST, SOLID SORBENT, OR SUPPORT THEREFOR: PRODUCT OR PROCESS OF MAKING |
| 100 | DF | CATALYST OR PRECURSOR THEREFOR {12} |
| 150 | DF | .~ Organic compound containing {13} |
| 152 | DF | .~.~ Organic compound including carbon-metal bond {5} |
| 157 | | .~.~.~ Alkali metal bonded to carbon |