RCs How unstable are Hex-En, Isopropylphenidate, 4f-MPH, 3-Meo-PCE in terms of storage?

[Rantanplan]

Hello,

do you know how unstable these drugs are? I know, store airtight, dark and cold is always the way to go.
But I was wondering how really stable these drugs are, if you do not store them right, like just in a living room (no direct sunlight)?
For example Phenethylamine do not care much, how they are stored. LSD is the opposite, it is very sensitive.

Also a general question: Is it possible to see in the molecular structure how stable a chemical is?

 

[Volsam]

I recommend using amber glass vials for storage.
IPH and Hexen have been sitting at the room temperature for more than a year with no reduction of effects or visual appearance (in amber glass vials).
Not sure about 4F-MPH or 3-MeO-PCE.