They don't, they are drastically different in character. There are close similarities within classes between some of the lysergamides, substituted phenethylamines or tryptamines. But even closely structurally related analogues can be extremely different (ex. 2C-E vs DOET vs 2C-C).
LSD is almost nothing like psilocybin or mescaline or DMT. And nothing is like salvinorin...
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