| Buthym - Bz | Nummer |
| Butyraldehyd | 16 |
| i-Butyraldehyd | xxx |
| Butyraldehydoxim | 14 |
| (±)-β-Butyrolacton | 16 / # (19a+c) |
| γ-Butyrolacton | 16 / # 54 Narkotisch |
| n-Butyronitril | 7 |
| Butyrylchlorid | 2 |
| 5-(3-Butyryl-2,4,6-trimethyl-phenyl)-2-[1-(ethoxy-imino) propyl]-3–hydroxy-cyclo-hex-2-en-1-on] |
# (19b) |
| Buxus sempervirens | 14 |
| Byssochlamys | 19a |
| B Z - Stoff | xxx |