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The TMA's
Summary data from PiHKAL

There are six possible analogues of TMA:

TMA: 3,4,5 trimethoxyamphetamine
Dose: 100-250 mg Duration: 6-8 h
Effects: Similar to mescaline but perhaps less pleasant. More active.
This is the amphetamine analogue of mescaline, and may be derrived from elemicin, a fraction of nutmeg oil.

TMA-2: 2,4,5 trimethoxyamphetamine
Dose: 20-40 mg Duration: 8-12 h
Effects: Strongly psychedelic, somewhat similar to mescaline. Pleasant.
Derrived from assarone, a component of calamus oil.

TMA-3: 2,3,4 trimethoxyamphetamine
Not found to be active at 100 mg

TMA-4: 2,3,5 trimethoxyamphetamine
Slight activity (~= 50 ug LSD) found at 80 mg ca. 6 h

TMA-5: 2,3,6 trimethoxyamphetamine
Mild stimulant and psychedelic effects found at 30 mg (~75 ug LSD) 8-10 h

TMA-6: 2,4,6 trimethoxyamphetamine
Dose: 25-50 mg Duration: 12-16 h
Effect: Very pleasant stimulant and psychedelic