| 44 / | HD | FUEL AND RELATED COMPOSITIONS | 
| 300 | DF | LIQUID FUELS (EXCLUDING FUELS THAT ARE EXCLUSIVELY MIXTURES OF LIQUID HYDROCARBONS) {31} | 
| 329 | DF | .~ Heterocyclic carbon compound containing a hetero ring having chalcogen or nitrogen as the only ring hetero atoms {6} | 
| 330 | DF | .~.~ Compound of indeterminate structure prepared by reacting a heterocyclic compound of known structure {2} | 
| 332 |  | .~.~.~ The heterocyclic compound reactant is an oxirane (e.g., reaction product of epihalohydrin with amine, epoxide reactions, etc.) |