2C-T-21.5 - Wikipedia

2C-T-21.5
Identifiers

IUPAC name 2-[4-(3,3-difluoropropylsulfanyl)-2,5-dimethoxyphenyl]ethanamine
CAS Number	648957-46-4
PubChem CID	12063258
Chemical and physical data
Formula	C₁₂H₁₇F₂NO₂S
Molar mass	277.33 g·mol⁻¹
3D model (JSmol)	Interactive image
SMILES COC1=CC(=C(C=C1CCN)OC)SCC(F)F
InChI InChI=1S/C12H17F2NO2S/c1-16-9-6-11(18-7-12(13)14)10(17-2)5-8(9)3-4-15/h5-6,12H,3-4,7,15H2,1-2H3 Key:LVCSIKISADNGMR-UHFFFAOYSA-N

2C-T-21.5, also known as 4-(2,2-difluoroethylthio)-2,5-dimethoxyphenethylamine, is a lesser-known psychedelic drug related to compounds such as 2C-T-21 and 2C-T-28. It was originally named by Alexander Shulgin and discussed in his book PiHKAL,^[1] but was not synthesised at that time. 2C-T-21.5 was ultimately synthesised and tested by Daniel Trachsel some years later. It has a binding affinity of 146 nM at 5-HT_2A and 55 nM at 5-HT_2C. It produces typical psychedelic effects, being slightly less potent but somewhat longer acting than 2C-T-2 or 2C-T-21,^[2]^[3]^[4] with an active dose of 12–30 mg, and a duration of action of 8–14 hours. Unlike 2C-T-21 it will not form the highly toxic fluoroacetate as a metabolite, instead producing the less toxic difluoroacetic acid.^[5]^[6]

References

[edit]

^ Alexander Shulgin. "2C-T-21". PiHKAL.
^ Trachsel D (2012). "Fluorine in psychedelic phenethylamines". Drug Testing and Analysis. 4 (7–8): 577–590. doi:10.1002/dta.413. PMID 22374819.
^ Luethi D, Trachsel D, Hoener MC, Liechti ME (May 2018). "Monoamine receptor interaction profiles of 4-thio-substituted phenethylamines (2C-T drugs)" (PDF). Neuropharmacology. 134 (Pt A): 141–148. doi:10.1016/j.neuropharm.2017.07.012. PMID 28720478.
^ Halberstadt AL, Luethi D, Hoener MC, Trachsel D, Brandt SD, Liechti ME (January 2023). "Use of the head-twitch response to investigate the structure-activity relationships of 4-thio-substituted 2,5-dimethoxyphenylalkylamines". Psychopharmacology. 240 (1): 115–126. doi:10.1007/s00213-022-06279-2. PMC 9816194. PMID 36477925.
^ Trachsel D, Lehmann D, Enzensperger C (2013). Phenethylamine: Von der Struktur zur Funktion. Nachtschatten Verlag AG. pp. 789–791. ISBN 978-3-03788-700-4.
^ WO 2023/156450, Nivorozhkin A, Hartsel JA, Canal CE, Salituro FG, Mueller TA, Greene BJ, Belser A, Avery KL, Reichelt AC, Varty GB, Palfreyman M, "Therapeutic phenethylamine compositions and methods of use.", published 24 August 2023, assigned to Cybin Irl Ltd.

No ring subs.	CYB004 (deuDMT) DALT DBT DcPT DET (T-9) DiPT DMT DPT EiPT EPT iPALT (ALiPT) MALT MET MiPT MPT NBoc-DMT NMT PALT PiPT Tryptamine (T)
4-Hydroxytryptamines	4-HO-DALT (daltocin) 4-HO-DBT 4-HO-DET (ethocin; CZ-74) 4-HO-DiPT (iprocin) 4-HO-DPT (deprocin) 4-HO-EPT (eprocin) 4-HO-MALT (maltocin) 4-HO-McPT 4-HO-MET (metocin) 4-HO-MiPT (miprocin) 4-HO-MPT (meprocin) 4-HO-NALT 4-HO-NBnT 4-HO-NET 4-HO-NiPT 4-HO-NPT 4-HO-T 4-HO-TMT 4-HO-5-MeO-DMT 4-MeO-DMT CYB003 (deupsilocin) Psilocin (4-HO-DMT; CX-59) 4-Phosphoryloxytryptamines: Aeruginascin (4-PO-TMT) Baeocystin (4-PO-NMT) Ethocybin (4-PO-DET; CEY-19) Norbaeocystin (4-PO-T) Psilocybin (4-PO-DMT; CY-39) 4-Acetoxytryptamines: 4-AcO-DALT (daltacetin) 4-AcO-DET (ethacetin) 4-AcO-DiPT (ipracetin) 4-AcO-DMT (psilacetin) 4-AcO-DPT (depracetin) 4-AcO-MALT 4-AcO-MET (metacetin) 4-AcO-MiPT (mipracetin) 4-GO-DMT (RE-109) 4-PrO-DiPT 4-PrO-DMT Luvesilocin (4-GO-DiPT; RE-104, FT-104)
5-Hydroxytryptamines	Bufotenin (5-HO-DMT) Serotonin (5-HT; 5-HO-T) 5-Acetoxytryptamines: O-Acetylbufotenine (5-AcO-DMT) O-Pivalylbufotenine (5-t-BuCO-DMT)
5-Methoxytryptamines	4-HO-5-MeO-DMT 5-MeO-2,N,N-TMT 5-MeO-4,N,N-TMT 5-MeO-DALT 5-MeO-DBT 5-MeO-DET 5-MeO-DiPT 5-MeO-DMT (mebufotenin) 5-MeO-DPT 5-MeO-EiPT 5-MeO-MALT 5-MeO-MET 5-MeO-MiPT 5-MeO-NiPT 5-MeO-NMT ASR-3001 (5-MeO-iPALT)
Other ring subs.	2,N,N-TMT 4,N,N-TMT 5-Bromo-DMT 5-Chloro-DMT 5-Fluoro-DMT 5-N,N-TMT 7,N,N-TMT 5-MeO-2,N,N-TMT 5-MeO-4,N,N-TMT 6-Fluoro-DMT Bretisilocin (GM-2505; 5-fluoro-MET)
α-Alkyltryptamines	4-HO-AMT 4-Methyl-AMT 5-Fluoro-AMT 6-Fluoro-AMT AMT (Indopan) α-Methylserotonin (5-HO-αMT) 5-Methoxy-α-alkyltryptamines: 5-MeO-AET α,N,N-TMT (α-Me-DMT; Alpha-N) 5-MeO-AMT (α,O-DMS; Alpha-O) α,N,O-TMS (5-MeO-α,N-DMT) α,N,N,O-TeMS (5-MeO-α,N,N-TMT)
Others	N-DEAOP-Ts (e.g., N-DEAOP-NET, N-DEAOP-NMT, 5-MeO-N-DEAOP-NMT, 5-MeO-N-DEAOP-NET) Structure undisclosed: CT-4201 EB-002 (EB-373) MSP-1014 MYCO-004
Cyclized	Ergolines/lysergamides (e.g., LSD) β-Carbolines and Harmala alkaloids (e.g., harmine, harmaline, 6-methoxyharmalan) Iboga alkaloids (e.g., 18-MAC, 18-MC, coronaridine, ibogaine, ibogamine, ME-18-MC, noribogaine, tabernanthine, voacangine) Ibogalogs (e.g., ibogainalog) O-Methylnordehydrobufotenine Partial ergolines (e.g., NDTDI, RU-28306, CT-5252) Piperidinylethylindoles (e.g., pip-T) Pyrrolidinylethylindoles (e.g., pyr-T, 5-MeO-pyr-T) Pyrrolidinylmethylindoles (e.g., MPMI, 4-HO-MPMI (lucigenol), 5-MeO-MPMI) Tetrahydropyridinylindoles (e.g., RU-28253 (5-MeO-THPI), NEtPhOH-THPI)
Bioisosteres	Benzofurans (e.g., 5-MeO-DiBF, dimemebfe (5-MeO-BFE), mebfap) Benzothiophenes (e.g., 3-APBT) Indazolethylamines (e.g., AL-38022A, O-methyl-AL-34662) Indenylethylamines (e.g., C-DMT) Isotryptamines (e.g., 6-MeO-isoDMT, Ro60-0175) MYCO-005 Quinolinylethylamines (e.g., mefloquine)

Scalines	2-Bromomescaline 3-TE 3-TM 4-Desoxymescaline (DESOXY) 4-TE 4-TM Allylescaline Beta-D Cyclopropylmescaline Difluoroescaline Difluoromescaline N,N-Diformylmescaline Escaline Fluoroescaline Fluoroproscaline N-Formylmescaline Isobuscaline Isoproscaline Jimscaline Mescaline (3,4,5-TMPEA) Metadifluoromescaline (MDFM) Metaescaline Methallylescaline N-Methylmescaline (M-M) NBOMe-escaline NBOMe-mescaline Proscaline Thioproscaline Tomscaline Trichocereine (N,N-dimethylmescaline; MM-M) Trifluoroescaline Trifluoromescaline
2C-x	2C-B 2C-Bn 2C-Bu 2C-C 2C-CN 2C-CP 2C-D 2C-E 2C-EF 2C-F 2C-H 2C-I 2C-iBu 2C-iP 2C-N 2C-NH2 2C-P 2C-Se 2C-Se-TFM 2C-tBu 2C-TFE 2C-TFM 2C-YN 2C-V 2C-T-x: 2C-T 2C-T-2 2C-T-3 2C-T-4 2C-T-5 2C-T-6 2C-T-7 2C-T-8 2C-T-9 2C-T-10 2C-T-11 2C-T-12 2C-T-13 2C-T-14 2C-T-15 2C-T-16 2C-T-17 2C-T-18 2C-T-19 2C-T-20 2C-T-21 2C-T-22 2C-T-22.5 2C-T-23 2C-T-24 2C-T-25 2C-T-27 2C-T-28 2C-T-30 2C-T-31 2C-T-32 CYB210010 (2C-T-TFM, 2C-T-36) 2C-O-x: 2C-O 2C-O-2 2C-O-4 Others: 2C-B-AN 2C-DB 2C-G-x (e.g., 2C-G-3, 2C-G-5) β-Keto-2C-B (βk-2C-B) β-Keto-2C-I (βk-2C-I) β-Methyl-2C-B (BMB) BOx (e.g., BOB, BOD, BOH-2C-B) HOT-x (e.g., HOT-2, HOT-7, HOT-17) N-Ethyl-2C-B TWEETIOs (e.g., 2CD-2-ETO, 2CD-5-ETO, 2CE-5-ETO, 2CE-5iPrO, 2CT2-5-ETO, ASR-2001 (2CB-5PrO))
3C-x	3C-AL 3C-BZ 3C-DFE 3C-E 3C-MAL 3C-P TMA (3C-M)
DOx	DOAM DOB DOBU DOC DOEF DOET DOH (2,5-DMA) DOI DOIB DOIP DOM DON DOPR DOTFM DOYN Aleph-x (DOT-x): Aleph (DOT) Aleph-2 Aleph-4 Aleph-6 Aleph-7 TMA-2 and derivatives (Mxx): MALM MEM MDFEM MFEM MIPM MMALM MPM MTFEM TMA-2 Others: DODB DODC DOM-NBOMe DOTMA Ganeshas (G-x) (e.g., Ganesha (G, G-0)
4C-x	4C-B 4C-C 4C-D (Ariadne) 4C-E 4C-I 4C-N 4C-P 4C-T-2
Ψ-PEA	Ψ-2C-DFMO (ψ-2C-O-35) Ψ-2C-T-4 Ψ-DODFMO Ψ-DOM TMA-6 (Ψ-TMA-2)
MDxx	5-Methyl-MDA 6-Methyl-MDA DMMDA DMMDA-2 EIDA EMDA-2 IDA Lophophine (MMDPEA) Lys-MDA MDA (tenamfetamine) MDHMA MDMA (midomafetamine; ecstasy) MDOH MMDA MMDA-2 MMDA-3a MMDMA N-t-BOC-MDMA (R)-MDMA
FLY	2C-B-FLY 2C-B-BUTTERFLY 2C-B-DragonFLY 2C-B-DragonFLY-NBOH 2C-B-FLY-NB2EtO5Cl 2CB-5-hemifly 2CBFly-NBOMe Bromo-DragonFLY DOB-FLY DOH-FLY TFMFly
25x-NB (NBOMes)	25x-NBOMe: 25B-NBOMe 25C-NBOMe 25CN-NBOMe 25D-NBOMe 25E-NBOMe 25F-NBOMe 25G-NBOMe 25H-NBOMe 25I-NBOMe 25iP-NBOMe 25N-NBOMe 25O-NBOMe 25P-NBOMe 25T-NBOMe 25T2-NBOMe 25T4-NBOMe 25T7-NBOMe 25TFM-NBOMe 25x-NBOH: 25B-NBOH 25C-NBOH 25CN-NBOH 25D-NBOH 25E-NBOH 25I-NBOH 25P-NBOH Others: 25B-NB (N-benzyl-2C-B) 2C-B-AN 2C2-NBOMe 2CBCB-NBOMe 2CBFly-NBOMe DOM-NBOMe NBOMe-escaline NBOMe-mescaline TGF-8027
Others	2-TOET 2-TOM 25B-NAcPip 4-HA 5-TOET 5-TOM Benzofurans (e.g., 5-APB, 5-APDB, 6-APB, 6-APDB, F, F-2, F-22) Benzothiophenes (e.g., 5-APBT, 6-APBT) CT-5172 DMAs (e.g., 2,4-DMA, 3,4-DMA) Fenfluramine MMA (3-MeO-4-MA) Norfenfluramine PEA-NDEPAs (e.g., 25D-NM-NDEAOP, DOB-NDEPA, DOI-NDEPA, DOM-NDEPA, DOTFM-NDEPA, M-NDEPA, TMA-2-NDEPA) PMA (4-MA) TMAs (e.g., TMA-3, TMA-4, TMA-5) TOMSO ZDCM-04 Structure undisclosed: CYB005
Cyclized	1-Aminomethylindanes (e.g., 2CB-Ind, jimscaline) 2-Aminoindanes (e.g., DOM-AI) 3-Benzazepines (e.g., lorcaserin) 3-Phenylpiperidines (e.g., LPH-5, LPH-48) Benzocyclobutenes (e.g., 2CBCB-NBOMe, TCB-2, tomscaline) Benzoxepins (e.g., BBOX, IBOX, TFMBOX) DMBMPP (juncosamine) Ergolines/lysergamides (e.g., LSD) Glaucine Partial ergolines (e.g., NDTDI, DEIMDHPCA, DEMPDHPCA, DEMTMPDHPCA, DEMNDHPCA) Phenylcyclopropylamines (e.g., DMCPA, TMT) Phenyloxazolamines (aminorexes) (e.g., 2C-B-aminorex) Pyridopyrroloquinoxalines (e.g., IHCH-7113) Z3517967757 ZC-B