The original falls under the category of TEK, and is posted here for information's sake.
It will be has been edited to better suite the environment of the Vespiary.

Goal: Obtain pure bufotenine freebase from cebil seeds.
[Note that the word pure is used lightly, as even the end product is significantly impure]

Bufotenin is known as N,N-dimethyl-5-hydroxytryptamine, or 5-HO-DMT
 [ CAS: 487-93-4    -  Melting point  146–147 °C    -   Boiling point  320°C ]

...

Procedure:

1. Weigh and grind whole cebil seeds to a fine powder using coffee grinder or mortar and pestle.

[ Note: Baking this powder at 300 ºF for aprox. 2 hours has shown to vaporize the other alkaloids not targeted ]

2. Add about 5 grams of sodium carbonate and mix to make a uniform mixture.

3. Add water slowly, bit by bit to make a doughy paste. Cover jar and let sit for an hour to allow reaction to complete. We are making a crude bufotenine freebase at this step, which contains bufotenine along with undesired, nausea producing compounds, as well as plant oils and fats

4. If the right consistency of paste was achieved in the previous step, then the sodium carbonate will have formed its hydrated state and we will be left with a hard dry cake. An ammonia smell will be apparent, indicating that the freebasing reaction has occurred. If an excess of water was used then just leave the jar uncovered and let the water evaporate away. Heat and a fan will speed up this operation. Bufotenine is very heat tolerant and the water could safely be boiled away if you are in a hurry.

5. Grind up the hard cake then cover with anhydrous acetone. The bufotenine will dissolve in the acetone forming a yellow solution while leaving behind any unused sodium carbonate behind. Pour off the acetone solution into a collection jar and repeat the process by adding more acetone for a total of three extractions.

6. Filter the combined three acetone extractions, through a cotton ball loosely stuffed in the narrow part of a funnel, to obtain a clear yellow acetone solution of crude bufotenine freebase.

7. Add the contents of a 500 mg fumaric acid capsule directly to this solution and observe an instantaneous crashing out of bufotenine fumarate. This is a defatting step and effectively removes the plant oils and fats. Let this sit for a while to allow the reaction to complete. The bufotenine fumarate will stick to the sides and bottom of the jar and the waste acetone containing the unwanted oils can be poured off. Allow any remaining acetone to evaporate away until its odour is gone.
[Note: the fumaric acid is added as a powder; as it dissolves in the acetone, it reacts with the freebase bufotenine forming bufotenine fumarate which precipitates out of solution, leaving room for more fumaric acid to dissolve. ]

8. Add enough water (about 50 ml) to dissolve the bufotenine fumarate then add about a gram of sodium carbonate powder directly to this solution. Like magic a caramel coloured lump of freebase bufotenine will form. This lump should be flattened out while adding an excess of water, to allow complete penetration by the sodium carbonate. Let this reaction continue for a while to completion, then pour off the water and dry out the caramel bufotenine.
[ Note: the powdered sodium carbonate dissolves in the water rapidly, causing the resulting bufotenine freebase oils to gather together into a clump of soft resinous material as it is pushed away from the more dense basic solution.

9. Completely dissolve the impure bufotenine in 5 mL of acetone then add 20 ml of naphtha ( 1 part acetone : 4 parts naphtha ). This will crash out the unwanted nausea causing compounds leaving pure bufotenine in an almost clear solution. Allow the reaction sufficient time to complete.
[Note: a 1:4 ratio of acetone:naphtha works to clean out the nausea causing compounds. In this method, all the impure bufo is completely dissolved in acetone before adding the naphtha. When the naphtha is added, then the impurities are precipitated.
This is different from the previous methods where the cosolvents are premixed before selectively dissolving the bufo, and ensures that all the bufo is extracted from the leftovers. ]

10. Use the medicine dropper to siphon off the clear bufotenine solution to another jar, leaving behind the nausea nasties.

11. Evaporate the solvent to obtain light tan, reasonably pure bufotenine freebase.

hhttps://www.dmt-nexus.me/forum/default.aspx?g=posts&t=10071

In following this extraction 120mg 5-HO-DMT was returned according to OriginalFace.
Citric acid has been used to achieve similar result in place of fumaric acid, but the order of operations then needed to be changed. 

Freebase Bufotenine Solubility
Acetone @ 20 C: soluble (5 g/100 ml)
Chloroform @ 20 C: soluble
Dichloromethane @ 20 C: soluble
Dimethyl sulfoxide (DMSO) @ 20 C: soluble (6 g/100 ml)
D-Limonene (Orange Oil) @ 20 C: insoluble
D-Limonene (Orange Oil) @ 176 C: soluble (more than 1.7 g/100 ml)
Ethanol @ 20 C: soluble
Ether @ 20 C: soluble
Ethyl acetate @ 20 C: soluble
Heptane @ 20 C: insoluble
Heptane with 40% MEK @ 20 C: soluble (0.53 g/100 ml)
Heptane with 50% MEK @ 20 C: soluble (1.22 g/100 ml)
IPA @ 20 C: soluble
MEK @ 20 C: soluble
Methanol @ 20 C: soluble
Naphtha @ 20 C: insoluble
Water @ 20 C: nearly insoluble in pure water (no acid or alkali added)
Xylene @ 20 C: nearly insoluble (less than 0.03 g/100 ml)
Xylene @ 144 C: soluble (1.5 g/100 ml)

hhttps://www.dmt-nexus.me/forum/default.aspx?g=posts&t=3053

When this extraction was scaled up (to 250g) by antrocles, although not initially successful, he was able to describe a situation where the solvent (and sodium carbonate) ratios needed to be improved.  His solution: separate the largely-aqueous solution into many glass jars. Add the equivalent volume of IPA to each solution. Then add an excess of sodium carbonate to cause the proper layer separation.

The yields can vary significantly even when following directions " to the 'T' " so don't expect anything specific.
Important: Bufotenine Fumarate is soluble in water, but insoluble in FASA (Fumaric Acid Saturated Acetone).