1B-LSD

1B-LSD (N1-butyryl-lysergic acid diethylamide) is an acylated derivative of lysergic acid diethylamide (LSD), which has been sold as a designer drug. In tests on mice it was found to be an active psychedelic, though with only around 1/7 the potency of LSD itself.

Legal status
1B-LSD is illegal in Singapore. Sweden's public health agency suggested classifying 1B-LSD as a hazardous substance, on June 24, 2019.