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Salvinorin B methoxymethyl ether is a semi-synthetic analogue of the natural product salvinorin A used in scientific research. It has a longer duration of action of around 2–3 hours, compared to less than 30 minutes for salvinorin A, and has increased affinity and potency at the κ-opioid receptor. It is made from salvinorin B, which is most conveniently made from salvinorin A by deacetylation. The crystal structure reveals that the methoxy group overlaps with the acetyl group of salvinorin A, but with a different orientation.
Salvinorin B methoxymethyl ether has a Ki of 0.60 nM at the κ opioid receptor, and is around five times more potent than salvinorin A in animal studies, although it is still only half as potent as its stronger homolog salvinorin B ethoxymethyl ether.