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Well direct precursors to any of those are HIGHLY REGULATED but there's ways around that. Raw materials can be procured and processed into precursors. Some native plants or you can grow exotic plants or synthesize some from benign chemicals. It's no small task though
I know it's openly available on the Internet here and other places it's 3:55am
I'll give you some hints where to look tomorrow but the rhodium chemistry vault at Erowid or the vespiary is a place to start
it's 3:55am