>>9783937see
>>9783884 it contains a lot of info
There is only one possible synthetical route to adrenochrome and it is by oxidation of adrenalin using silver oxide. All other oxidant will over-oxidise.
There are two forms of synthetic adrenochrome: the free adrenochrome which are blood-red crystals, but very unstable even when pure and kept at -40°C it has only a shelf life of a few months at most. This is psychoactive.
Second synthetic form is called "adrenochrome semicarbazone", it is an addition product and much more stable, looks like yellow-orange crystals (iirc). It can be kept for years and is actually used in medicine as a hemostatic agent (blood clotting). However, this one is not psychoactive, because the body cannot split the semicarbazone moeity and the whole is metabolized in a different way, never free adrenochrome is generated.
Fresh blood of a tortured animal/child would still be preferable, as next to adrenochrome it also contains adrenolutin (also psychoactive), dopachrome (dopamine analog of adrenochrome) and other stress hormone type compounds. Drinking the blood would be preferable, just you need to take chelating agents against iron toxicity (red blood cells contain iron-).
But I guess if you are addicted and your adrenal functions are completely fucked up, when no kids are available, synthetic adrenochrome would be like methadone for a heroin junk I guess.