| Record No. | Name | No. of Entries |
| 426 | Laurifoline chloride | 1 |
| 427 | Laurolitsine | 2 |
| 428 | Laurotetanine | 2 |
| 429 | Levallorphan | 1 |
| 430 | Liriodendronine | 1 |
| 431 | Liriodendronine 2-O-methyl ether | 1 |
| 432 | Liriodenine | 45 |
| 433 | Liriodenine methiodide | 1 |
| 434 | Longifolonine | 2 |
| 435 | Lopac0_000176 | 1 |
| 436 | Lophocerine | 1 |
| 437 | Lophophorine | 1 |
| 438 | LS-178516 | 1 |
| 439 | LS-21469 | 1 |
| 440 | LS-21480 | 1 |
| 441 | LS-21485 | 1 |
| 442 | LS-85800 | 1 |
| 443 | LS-87157 | 1 |
| 444 | LS-87158 | 1 |
| 445 | LS-97008 | 1 |
| 446 | LS-97010 | 1 |
| 447 | LS-97014 | 1 |
| 448 | LS-97019 | 1 |
| 449 | Lumicolchicines | 1 |
| 450 | Lysicamine | 1 |