| Not official USP-NF text | ||||
| THIOGUANINE | ||||
| PF | LGS# | Brand | Type of Test | Additional Information |
| 30(6) | L1 | Hypersil BDS C-18 | Assay and Limit of . . . . | Assay and limit of guanine. 4.6 mm x 5 cm, 5 µm, manufacturer Thermo Electron. |
| 17(2) | G43 | None Cited | Organic volat. impurities | See Method V  467 |