44 / | HD | FUEL AND RELATED COMPOSITIONS |
300 | DF | LIQUID FUELS (EXCLUDING FUELS THAT ARE EXCLUSIVELY MIXTURES OF LIQUID HYDROCARBONS) {31} |
314 | DF | .~ Boron containing {4} |
318 | .~.~ Three identical or diverse chalcogens bonded directly to the boron {1} | |
319 | DF | .~.~.~> Carbon, chalcogen, and boron in the same ring |