||Both MDMA and 2C-T-7 are phenethylamines. In general, the phenethylamines as a class are quite stable molecules. |
Peyote buttons which are hundreds or even thousands of years old have been found by archaeologists and analyzed in labs, and these buttons still contained about the same ammount of mescaline as you would expect to find in a freshly dried button. Alexander Shulgin has remarked that if MDMA had existed in the time of the pharaohs and buried in the pyramids, it would still be good today. Regarding 2C-T-7, I asked Dr. Shulgin about its shelf life and he remarked that he once analyzed a 15 year old sample of the chemical and found that it had degraded very little, if any.
MAPS has a supply of MDMA for research that was manufactured by Dr. David Nichols and subsequently stored in a safe at Purdue University. When Dr. Nichols tested this supply for purity in 1994 -- eight years after it was synthesized -- it showed no indication of deterioration.
If stored in a cool, dry and closed container such as an amber glass vial (avoid excessive heat, light or moisture), its safe to assume that MDMA and 2C-T-7 will both last longer than you will.