| 44 / | HD | FUEL AND RELATED COMPOSITIONS |
| 300 | DF | LIQUID FUELS (EXCLUDING FUELS THAT ARE EXCLUSIVELY MIXTURES OF LIQUID HYDROCARBONS) {31} |
| 436 | DF | .~ Organic oxygen compound containing (e.g., alicyclic alcohols, hypochlorites, etc.) {9} |
| 443 | DF | .~.~ Plural oxygens attached indirectly to each other by acyclic nonionic bonding {2} |
| 444 | ![]() | .~.~.~ Plural oxygens bonded directly to the same acyclic or alicyclic carbon (e.g., acetals, etc.) |