| Agent Name | Agent Number | CAS Number | Last Updated | |
|---|---|---|---|---|
| BUTABARBITAL | 1335 | 143-81-7 | 06/16/2025 | Summary |
| BUTACIDE | 1653 | 51-03-6 | 09/24/2025 | Summary |
| BUTACLAMOL | 3187 | 36504-93-5 | 06/26/2025 | Summary |
| BUTADIENE-STYRENE POLYMER | 2752 | 9003-55-8 | 04/24/2025 | Summary |
| BUTALBITAL | 1033 | 77-26-9 | 08/31/2025 | Summary |
| BUTAMBEN | 3443 | 94-25-7 | 07/10/2025 | Summary |
| BUTANAL | 2033 | 123-72-8 | 03/22/2025 | Summary |
| BUTANE | 1673 | 106-97-8 | 09/26/2025 | Summary |
| BUTANEDIOLS | 3085 | NONE | 08/21/2025 | Summary |
| BUTANOIC ACID | 2295 | 533-68-6 | 03/12/2025 | Summary |
| BUTANONE, 2- | 1520 | 78-93-3 | 10/15/2025 | Summary |
| BUTAPREN | 1948 | 2180-92-9 | 10/11/2025 | Summary |
| BUTAZOLIDINE | 1813 | 50-33-9 | 08/13/2025 | Summary |
| BUTAZONIC | 3467 | 129-20-4 | 07/11/2025 | Summary |
| BUTENAFINE | 4171 | 101828-21-1 | 07/16/2025 | Summary |