Other N1-substituted lysergamides undergo extensive
N1-dealkylation in vivo,
[73–75] and it is possible that 1P-LSD is hydrolyzed
to LSD. Indeed, ALD-52 is equipotent with LSD in humans [76]
and is considered to serve as a pro-drug, although this does not
seem to have ever been confirmed empirically. In order to gain
initial insights into the potential for hydrolysis, 1P-LSD was exposed
to incubation in human serum at 37°C followed by LC-MS analysis
in selective ion monitoring mode. As shown in the Supporting
Information, LSD detection was observed under a variety of
exposure times. Follow-up studies are currently being conducted
to compare the affinity and selectivity of LSD and 1P-LSD at 5-HT
receptors, and to determine whether 1P-LSD is hydrolyzed to LSD
in vivo