| (9R)-delta 6a(10a)-Tetrahydrocannabinol | (9R)-delta 6a(10a)-THC | (R)-3,10,10-trimethyl-7-pentyl-2,3,4,10-tetrahydro-1H-9-oxaphenanthren-5-ol | C21H30O2 | Cannabinoids | 10-2022 | | Structure Image cannot be exported |
| 1,2-Dibromo-4,5-methylenedioxybenzene | | 5,6-dibromo-2H-1,3-benzodioxole | C7H4Br2O2 | Other substances | 06-2019 | | Structure Image cannot be exported |
| 1,4-Benzodiazepine | | 1H-1,4-benzodiazepine | C9H8N2 | Benzodiazepines | 01-2021 | | Structure Image cannot be exported |
| 1,4-Dibenzylpiperazine | DBZP | 1,4-dibenzylpiperazine | C18H22N2 | Piperazines (Stimulant) | 07-2008 | | Structure Image cannot be exported |
| 1-(1,3-Diphenylpropan-2-yl)-pyrrolidine | 1-[2-phenyl-1-(phenylmethyl)ethyl]-pyrrolidine | 1-(1,3-diphenylpropan-2-yl)pyrrolidine | C19H23N | Other substances | 12-2018 | | Structure Image cannot be exported |
| 1-(2-Fluorophenyl)piperazine | 2-FPP;oFPP;ortho-fluorophenylpiperazine | 1-(2-fluorophenyl)piperazine | C10H13FN2 | Piperazines (Hallucinogen) | 03-2012 | | Structure Image cannot be exported |
| 1-(2-Methoxyphenyl)piperazine | 2-MeOPP;ortho-MeOPP | 1-(2-methoxyphenyl)piperazine | C11H16N2O | Piperazines (Stimulant) | 07-2008 | | Structure Image cannot be exported |
| 1-(3,4-Methylenedioxyphenyl)-1,2-propanedione | | 1-(2H-1,3-benzodioxol-5-yl)propane-1,2-dione | C10H8O4 | Other substances | 01-2022 | | Structure Image cannot be exported |
| 1-(3-Methoxyphenyl)piperazine | 3-MeOPP;meta-MeOPP | 1-(3-methoxyphenyl)piperazine | C11H16N2O | Piperazines (Stimulant) | 05-2018 | | Structure Image cannot be exported |
| 1-(3-Trifluoromethylphenyl)piperazine | TFMPP | 1-[3-(trifluoromethyl)phenyl]piperazine | C11H13F3N2 | Piperazines (Hallucinogen) | 04-2002 | | Structure Image cannot be exported |
| 1-(4-Chlorophenyl)piperazine | 4-CPP;pCPP;para-chlorophenylpiperazine | 1-(4-chlorophenyl)piperazine | C10H13ClN2 | Piperazines (Hallucinogen) | 07-2003 | | Structure Image cannot be exported |
| 1-(4-Fluorobenzyl)piperazine | 4F-BZP;para-fluoro-BZP;para-fluoro-benzylpiperazine | 1-(4-fluorobenzyl)piperazine | C11H15FN2 | Piperazines (Stimulant) | 05-2017 | | Structure Image cannot be exported |
| 1-(4-Fluorophenyl)piperazine | 4-FPP;pFPP;para-fluorophenylpiperazine | 1-(4-fluorophenyl)piperazine | C10H13FN2 | Piperazines (Hallucinogen) | 07-2008 | | Structure Image cannot be exported |
| 1-(4-Methoxyphenyl)piperazine | 4-MeOPP;para-MeOPP | 1-(4-methoxyphenyl)piperazine | C11H16N2O | Piperazines (Hallucinogen) | 04-2011 | | Structure Image cannot be exported |
| 1-Acetylpiperidine | | 1-1-piperidyl-1-ethanone | C7H13NO | Other substances | 10-1998 | | Structure Image cannot be exported |
| 1-Benzylpiperidine | | 1-benzylpiperidine | C12H17N | Other substances | 10-2022 | | Structure Image cannot be exported |
| 1-Boc-4-(4-fluoroanilino)piperidine | | tert-butyl 4-(4-fluorophenylamino)piperidine-1-carboxylate | C16H23FN2O2 | Fentanyl and Fentanyl-related | 05-2021 | | Structure Image cannot be exported |
| 1-Boc-4-anilinopiperidine | 1-BOC-4-(phenylamino)piperidine;4-ANBocP;4-anilino-1-Boc-piperidine;N-Boc-4-AP | tert-butyl 4-(phenylamino)piperidine-1-carboxylate | C16H24N2O2 | Other substances | 05-2020 | | Structure Image cannot be exported |
| 1-Boc-4-piperidone | | tert-butyl 4-oxopiperidine-1-carboxylate | C10H17NO3 | Fentanyl and Fentanyl-related | 02-2022 | | Structure Image cannot be exported |
| 1-Cyclohexylpiperazine | N-cyclohexylpiperazine | | C10H20N2 | Other substances | 01-2023 | | Structure Image cannot be exported |
| 1-Formylpiperidine | | 1-piperidinecarbaldehyde | C6H11NO | Other substances | 10-1998 | | Structure Image cannot be exported |
| 1-Methylpiperidine | | 1-methylpiperidine | C6H13N | Other substances | 10-1998 | | Structure Image cannot be exported |
| 1-Phenethyl-4-hydroxypiperidine | | 1-(2-phenylethyl)piperidin-4-ol | C13H19NO | Fentanyl and Fentanyl-related | 09-2021 | | Structure Image cannot be exported |
| 1-Phenethyl-4-propionyloxypiperidine | | 1-phenethylpiperidin-4-yl propionate | C16H23NO2 | Fentanyl and Fentanyl-related | 09-2021 | | Structure Image cannot be exported |
| 1-Phenyl-2-nitropropene | P2NP | [(1E)-2-nitroprop-1-en-1-yl]benzene | C9H9NO2 | Other substances | 10-2018 | | Structure Image cannot be exported |