| Record No. | Name | No. of Entries |
| 576 | NSC169687 | 1 |
| 577 | NSC274893 | 1 |
| 578 | NSC282680 | 1 |
| 579 | NSC326126 | 1 |
| 580 | NSC326127 | 1 |
| 581 | NSC326129 | 1 |
| 582 | NSC326130 | 1 |
| 583 | NSC404377 | 1 |
| 584 | NSC628305 | 1 |
| 585 | NSC635458 | 1 |
| 586 | NSC99802 | 1 |
| 587 | Nuciferine | 3 |
| 588 | O(3)-monoacetylmorphine | 1 |
| 589 | O,O'-Di(4-bromobenzoyl)apomorphine | 1 |
| 590 | O,O'-Di(4-fluorobenzoyl)apomorphine | 1 |
| 591 | O,O'-Di(4-methylbenzoyl)apomorphine | 1 |
| 592 | O,O-bisacetyldaurisoline | 1 |
| 593 | O-(4-ethoxybutyl)berbamine | 1 |
| 594 | O-Methyl thalicberine | 1 |
| 595 | O-Methylbulbocapnine | 1 |
| 596 | O-Methyldauricine | 1 |
| 597 | O-Nornuciferine | 1 |
| 598 | O6-Acetylmorphine hydrochloride | 1 |
| 599 | OBABERINE | 8 |
| 600 | Oblongine | 1 |